Top Security Engineer Job Interview Questions

1

Explain WEP cracking and types of WEP.

Reference answer

WEP cracking is a form of security protocol that provides a level of security and privacy to a wireless LAN .There are two types of cracking Active and passive cracking. Active cracking attack have an increased load effect on the network but it is easy to detect compared to passive cracking. On the other hand, Passive cracking has no effect on the network traffic until WEP is cracked and it's hard to detect.

2

What is quantum cryptography, and what are its implications for security?

Reference answer

Quantum cryptography applies quantum mechanical concepts to create highly secure communication methods. Accordingly, this would make it quite challenging to decrypt such encryption, hence necessitating fresh methods of keeping our privacy undisturbed since quantum computers could lead to disarray.

3

What is security auditing?

Reference answer

In cybersecurity, a security audit examines the whole of a firm's computer systems, its policies, and their functions, with a view to identifying areas of vulnerability that can be exploited by unauthorized users.

4

What is a cloud-based threat intelligence platform?

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A cloud-based threat intelligence platform is a solution that provides real-time threat intelligence feeds to help organizations improve their incident response and threat prevention capabilities.

5

What is a hash function?

Reference answer

A hash function is a mathematical function that takes input data of any size and produces a fixed-size string of characters, known as a message digest.

6

How would you conduct a security code review?

Reference answer

I would conduct a security code review by: understanding the application's architecture and threat model, focusing on critical areas (e.g., authentication, data storage, input/output handling). I would use automated tools (e.g., SAST) to flag common issues, then manually review the code for logic flaws, business logic errors, and context-specific vulnerabilities. I would check for proper use of cryptographic libraries, secure configuration, and adherence to security best practices.

7

What Is Forward Secrecy?

Reference answer

Forward secrecy is a feature of certain key agreement protocols that generates a unique session key for each transaction. Thanks to forward secrecy, an intruder cannot access data from more than one communication between a client and a server—even if the security of one communication is compromised.

8

Name some common types of cyberattacks.

Reference answer

The most widely-seen cyberattacks are: - Malware - Password attacks - Phishing - Malvertising - Man in the Middle (MITM) - DDoS - Drive-by Downloads - Rogue software

9

Are there other engineering interview guides I should check out?

Reference answer

Absolutely! Try our guides for systems engineers and biomedical engineers for more inspiration.

10

How do you stay updated on cybersecurity news and trends?

Reference answer

"I regularly follow cybersecurity blogs such as Krebs on Security and The Hacker News to stay informed. Currently, I'm pursuing a CompTIA Security+ certification to deepen my understanding. I also participate in local security meetups, which helps me network with professionals and discuss the latest threats. This proactive approach ensures I'm always aware of emerging challenges."

11

Describe a time you identified and mitigated a critical security vulnerability.

Reference answer

"At a previous role with a fintech company, I discovered a vulnerability in our API that could expose sensitive user data. I conducted a thorough risk analysis and collaborated with the development team to implement additional authentication measures and encryption protocols. This proactive approach reduced our vulnerability exposure by 70% and maintained compliance with data protection regulations."

12

What are the differences between IDS and IPS?

Reference answer

An intrusion detection system or IDS is a system that detects possible intrusions. However, it's often less efficient compared to the intrusion prevention system (IPS). The IPS helps streamline the security process as a whole. Both IDS and IPS compare network packets to databases that contain signatures of cyberattacks. They also flag any packets that match the cyberattack signatures.

13

What is Same Origin Policy and CORS?

Reference answer

The Same Origin Policy (SOP) is a security mechanism in browsers that restricts web pages from making requests to a different origin (domain, protocol, or port) than the one that served the page. CORS (Cross-Origin Resource Sharing) is a protocol that allows servers to relax the SOP by specifying which origins are permitted to access resources, using HTTP headers like Access-Control-Allow-Origin.

14

Explain the concept of hashing and how it is used in security.

Reference answer

Hashing is a one-way function that converts input data into a fixed-size string of characters. It is used for data integrity verification, password storage, and digital signatures.

15

How would you secure data stored in cloud databases?

Reference answer

To secure data in cloud databases, I would implement: 1) Encryption at rest using managed keys (e.g., AWS KMS, Azure Key Vault) with automatic key rotation. 2) Encryption in transit by enforcing TLS for all connections. 3) Network isolation by placing databases in private subnets with no direct internet access. 4) Identity and access management using database-specific IAM roles or native authentication with strong password policies. 5) Regular patching and updates for the database engine. 6) Database activity monitoring and auditing (e.g., AWS RDS Performance Insights, Azure SQL Auditing). 7) Data classification and masking for sensitive fields. 8) Automated backups with encryption and tested restoration procedures.

16

Do you know how Single Sign-On works?

Reference answer

Single Sign-On (SSO) allows a user to authenticate once and gain access to multiple applications without re-entering credentials. It works using a central authentication service (e.g., SAML, OAuth, or Kerberos). The user logs in to an identity provider (IdP), which issues a token or session cookie. When the user accesses another application, the token is presented to the service provider, which validates it with the IdP, granting access.

17

How would you secure a Mongo database?

Reference answer

To secure a MongoDB database, I would: enable authentication and create strong user roles, bind to localhost or a private network, use TLS for data in transit, enable auditing, apply IP whitelisting, disable the HTTP interface, keep the database updated, use encryption at rest (e.g., WiredTiger encryption), and regularly backup data. Additionally, I would follow the principle of least privilege for user accounts.

18

What are the challenges for secure IoT?

Reference answer

Here is list of things that make security of IoT devices difficult: i) Lack of proper protection measures: Numerous internet-of-things gadgets compromise user security. ii) Several attacking options: More devices mean more potential entry points for hackers. iii) Disorganized infrastructures: With numerous different types of objects as well as arrangements, ensuring total security becomes impossible. iv) Ensuring privacy: It is never easy to prevent unauthorized access to personal information. v) Not enough power: These devices lack much processing power or memory, so it's difficult to add strong security.

19

What is your approach to incident response planning in a cloud environment?

Reference answer

My approach to incident response planning involves a structured plan with clear steps for identification, containment, eradication, and recovery. I use tools like AWS CloudTrail and Azure Security Center for real-time detection and management, and conduct regular drills to ensure the team is prepared for any incident.

20

Can you describe a time you performed threat modeling on a past project?

Reference answer

In a past project, I worked on a threat model for a financial app. We identified several potential threats, including unauthorized access attempts and data leakage. By addressing these threats early, we implemented robust access controls and encryption protocols. An ideal candidate will not only recount the technical aspects but also reflect on the learning outcomes and how those experiences improved their subsequent threat modeling efforts.

21

What are the challenges of wireless networks?

Reference answer

Wireless networks are hard to set up for a number of reasons: i) Signals could be disrupted by walls or other devices ii) sometimes the signal has to be made strong everywhere it is needed n iii) To prevent unauthorized access and data theft, we sometimes have to control the amount of stuff traveling around and maintain the network's health.

22

How would you prevent a supply chain attack in a CI/CD environment?

Reference answer

To prevent supply chain attacks in a CI/CD environment, I would: 1) Use trusted base images from official repositories and pin versions with specific digests. 2) Scan all third-party dependencies and container images for vulnerabilities using automated tools. 3) Implement software bill of materials (SBOM) generation and analysis for all artifacts. 4) Enforce code signing and artifact verification at every stage. 5) Use secure, isolated build environments with minimal network access. 6) Implement access controls on the CI/CD system, including MFA for pipeline administrators. 7) Regularly audit and rotate credentials used in the pipeline. 8) Monitor for suspicious activity in the build pipeline, such as unauthorized modifications to build scripts or dependencies. 9) Use tools like in-toto to ensure the integrity of the software supply chain.

23

How do you fingerprint an iPhone so you can monitor it even after wiping it?

Reference answer

Fingerprinting an iPhone to monitor it after wiping is extremely difficult due to iOS security features. Techniques might include: using hardware-based identifiers like the device's serial number or IMEI (though these can be changed), planting a persistent tracking mechanism in the baseband firmware, or using a vulnerability to install a rootkit in the boot ROM. Most of these require advanced exploits and are not practical for typical monitoring.

24

What is a MITM attack?

Reference answer

A man in the middle (MITM) attack is when an unauthorized person eavesdrops on or enters a conversation between a user and application. This unauthorized person may also impersonate the application or chatbot, making it seem like a normal conversation when their actual target is to steal the user's personal information such as login credentials, credit card information, or account details.

25

How would you advise other employees in the organization to avoid identity theft?

Reference answer

I would offer them the following tips: - Make sure you use a strong password including letters, numbers, and special characters - Only shop via popular and trusted websites - Don't share any passwords with anyone - Install advanced spyware and malware protection tools on your computers - Keep your system and software up-to-date - Don't share confidential information online or on social media - Make sure your browser is up-to-date

26

What is OSI model?

Reference answer

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a communication system into seven abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Each layer serves a specific role, from physical transmission to application services, facilitating interoperability between different systems.

27

What experience do you have with compliance frameworks like SOC 2, ISO 27001, or PCI DSS?

Reference answer

I've led SOC 2 Type II preparation at my current company and maintained PCI DSS compliance for our payment processing environment. My approach involves mapping technical controls to compliance requirements and implementing automated compliance monitoring where possible. For our SOC 2 audit, I created a control matrix documenting how each security control addresses specific audit criteria and established quarterly internal assessments to ensure ongoing compliance. I also worked with our legal team to ensure our incident response procedures met notification requirements. During our PCI compliance project, I segmented our cardholder data environment and implemented network monitoring to demonstrate that sensitive data never leaves the secure zone.

28

What is cognitive cybersecurity?

Reference answer

Cognitive Cybersecurity is using AI that relies on human thought processes to uncover threats and protect both digital and physical systems. Using a high-powered computer model, self-learning security systems use natural language processing, data mining, and pattern recognition to mimic the human brain.

29

How do you secure cloud environments as an IT Security Engineer?

Reference answer

I apply cloud-native security controls such as AWS Security Hub, Azure Security Center, and GCP Security Command Center. Security includes identity and access management, encryption of data, logging and monitoring, and applying least privilege principles.

30

How would you integrate AI tools into existing security frameworks?

Reference answer

This is an emerging question for 2026 interviews. Candidates should discuss methods such as assessing current security infrastructure, identifying areas where AI can automate routine tasks (e.g., log analysis, threat detection), and implementing AI-driven tools like machine learning models for anomaly detection. They should also address integration challenges, such as data compatibility, model training, and maintaining human oversight for critical decisions.

31

Describe your approach to container security in the cloud.

Reference answer

“Container security requires a multilayered approach throughout the entire lifecycle. In my previous role, I implemented security scanning in our CI/CD pipeline using Twistlock to catch vulnerabilities in base images before deployment. We used distroless images to minimize the attack surface and implemented runtime protection with Falco to detect anomalous behavior. For orchestration security, I configured Kubernetes RBAC with least-privilege principles and used Pod Security Standards to enforce security policies. We also implemented network policies to control traffic between pods and used service mesh technology with Istio for encrypted communication and additional access controls.”

32

How would you secure communication between microservices?

Reference answer

To secure communication between microservices, I would implement a service mesh (e.g., Istio, Linkerd) to enforce mutual TLS (mTLS) for all service-to-service communication, ensuring both encryption and authentication. I would also use network policies to restrict which services can communicate, following a zero-trust model. For authentication, I would use short-lived tokens or service account credentials. I would implement API gateways with rate limiting, authentication, and request validation for external-facing services. All communication would be logged and monitored for anomalies. Additionally, I would avoid sharing sensitive data in request headers or query parameters and use secure message formats (e.g., gRPC with TLS).

33

How would you secure an organization's migration to cloud infrastructure?

Reference answer

I'd begin with a comprehensive inventory and risk assessment of all systems and data being migrated to understand our security requirements. I'd implement a cloud-first identity strategy using SAML or OIDC integration with our existing identity provider, enforcing multi-factor authentication and conditional access policies based on user location and device trust. I'd design a network architecture using VPCs with proper segmentation and security groups, implementing a hub-and-spoke model for hybrid connectivity. All data would be classified according to sensitivity, with appropriate encryption and access controls applied. I'd use infrastructure-as-code with security scanning integrated into our deployment pipeline and implement cloud security posture management tools for continuous compliance monitoring. I'd also establish cloud-specific incident response procedures and ensure our security team is trained on cloud-native security tools and best practices.

34

How do you ensure that you maintain a balance between being detail-oriented and focusing on the big picture when dealing with security infrastructure?

Reference answer

I prioritize tasks by risk and impact. For critical vulnerabilities, I dive deep into technical details to ensure accurate remediation. For strategic planning, I step back to assess overall security posture and align with business goals. I use frameworks like risk assessments to balance granular technical analysis with high-level strategy, ensuring both are addressed appropriately.

35

What's your process for reducing false positives?

Reference answer

My process for reducing false positives involves: 1) Tuning detection rules by adjusting thresholds, whitelisting known benign activities, and using contextual filters (e.g., time of day, user role). 2) Correlating multiple signals to increase confidence before generating an alert. 3) Implementing a feedback loop where analysts can tag alerts as false positives and use that feedback to refine rules. 4) Regularly reviewing alert volumes and types to identify patterns of false positives. 5) Using machine learning models that can adapt to normal behavior over time. 6) Ensuring proper log normalization and enrichment to reduce ambiguity. 7) Testing new detection rules in a staging environment before production deployment. 8) Collaborating with teams to understand normal operational activities that may trigger alerts.

36

What is the Three-way handshake?

Reference answer

TCP uses a three-way handshake to establish reliable connections. The connection is full-duplex, with synchronization (SYN) and acknowledgment (ACK) on both sides. The exchange of these four flags is done in three steps: SYN, SYN to ACK and ACK.

37

Describe the difference between synchronous and asynchronous encryption.

Reference answer

Synchronous encryption, also known as symmetric encryption, uses the same key for both encryption and decryption. Asynchronous encryption, also known as asymmetric encryption, uses a pair of keys: a public key for encryption and a private key for decryption.

38

How do you ensure security in large-scale IT environments?

Reference answer

I follow a layered security model by implementing defense-in-depth strategies, including perimeter defenses, endpoint protection, identity management, and security monitoring. I also ensure security baselines are applied consistently across all systems through automation and continuous monitoring.

39

What is the main objective of Cyber Security?

Reference answer

The primary goal of cyber security is to protect data. To safeguard data from cyber-attacks, the security sector offers a triangle of three connected principles. The CIA trio is the name for this principle. The CIA model is intended to help organizations develop policies for their information security architecture. One or more of these principles has been broken when a security breach is discovered. Confidentiality, Integrity, and Availability are the three components of the CIA model. It's a security paradigm that guides individuals through many aspects of IT security. Let's take a closer look at each section. Confidentiality: Confidentiality is the same as privacy in that it prevents unauthorized access to data. It entails ensuring that the data is only accessible to those who are authorized to use it, as well as restricting access to others. It keeps vital information from getting into the wrong hands. Data encryption is a great example of keeping information private. Integrity: This principle assures that the data is genuine, correct, and safe from unwanted threat actors or unintentional user alteration. If any changes are made, precautions should be taken to protect sensitive data from corruption or loss, as well as to quickly recover from such an incident. Furthermore, it denotes that the source of information must be genuine. Availability: This principle ensures that information is constantly available and helpful to those who have access to it. It ensures that system failures or cyber-attacks do not obstruct these accesses.

40

What is a Security Information and Event Management (SIEM) System?

Reference answer

A system for gathering and analyzing data on security threats in order to identify and counter them takes information from various sources. All security activity is monitored.

41

How do you handle cloud security monitoring and incident response?

Reference answer

“I believe in proactive monitoring with automated response capabilities. In my current setup, I use AWS CloudTrail for API logging, GuardDuty for threat detection, and CloudWatch for infrastructure monitoring. I've configured custom rules in GuardDuty to detect unusual API activity and set up automatic responses through Lambda functions—for example, automatically disabling suspicious user accounts or isolating compromised instances. When an incident occurs, I follow our documented playbook that includes immediate containment, evidence preservation, and stakeholder communication. Last year, we detected a potential data exfiltration attempt through unusual S3 access patterns, and our automated response isolated the affected resources within minutes while we conducted a full investigation.”

42

What are the 6 aggregate functions of SQL?

Reference answer

The six common aggregate functions in SQL are: COUNT (returns the number of rows), SUM (returns the sum of values), AVG (returns the average), MIN (returns the minimum value), MAX (returns the maximum value), and GROUP_CONCAT (or LISTAGG) (concatenates values from multiple rows into a single string).

43

What are cloud-based security metrics and reporting?

Reference answer

Cloud-based security metrics and reporting is a solution that provides real-time visibility into cloud security posture, risk, and compliance.

44

What is a virus?

Reference answer

A virus is a type of malware that attaches itself to a program or file to replicate itself and spread to other systems.

45

What experience do you have in information security?

Reference answer

Senior security engineers typically have a bachelor's degree in computer science or a related field. They should also have several years of experience working in information security.

46

Design a secure file-sharing platform for enterprise clients.

Reference answer

I would design a secure file-sharing platform using SALT. Scope: Enterprise clients, high security, compliance with SOC 2 and HIPAA. Assets: User-uploaded files, metadata, encryption keys, audit logs. Threats: Unauthorized access, data leakage, ransomware, insider threats. Layers: Identity and access with SSO, MFA, and RBAC. Data at rest encrypted with AES-256 using per-file keys managed by KMS. Data in transit with TLS 1.3. Network segmentation with VPCs and security groups, API gateway with rate limiting. Application-layer controls include client-side encryption for sensitive files, file integrity checks, and virus scanning on upload. Monitoring with centralized logging, file access audit trails, and anomaly detection for unusual download patterns. Tradeoffs: Client-side encryption reduces server-side visibility and complicates search; we would mitigate by allowing metadata search only. Performance impact of encryption is managed with dedicated hardware.

47

Explain digital signature.

Reference answer

A digital signature uses cryptographic techniques to validate the sender's identity and safeguard the authenticity of a digital message, document, or transaction, preventing unauthorized changes.

48

Why is a disaster recovery plan important?

Reference answer

In case of any major issue, like a cyber attack or a natural disaster, a company can refer to the disaster recovery plan.

49

What are the different types of network security?

Reference answer

Below are different types of network security for various aspects that might make communication easier. i) Firewall-Security: – This type of security tends to watch and also do digestion of network traffic as it either gets into or even goes out of a certain network. ii) Intrusion Detection System (IDS):– It checks network traffic to identify any form of suspicious activity that may eventually breach the pre-defined strategies implemented by an organization. Intrusion prevention systems are basically systems put in place to put away from the network of those activities that are suspicious iii) Virtual Private Networks (VPNs) are able to provide protection for unsafe connections over the internet. iv) Antivirus and Anti-Malware Software-This Software helps to prevent from malware and viruses. v) Who has the right to make use of resources on the network are managed through access controls. vi) While data is moving around, it is kept secure using encryption. vii) To limit attacks, a network is divided into smaller components in network segmentation. viii) Security Information Management together with Security Event Management (SIEM) – this audits and analyzes logs from different types of network devices with the aim of identifying and responding to security incidents in real-time.

50

Can you describe a time when you identified a security vulnerability and implemented a solution to mitigate the issue?

Reference answer

One example that comes to mind is when I was working as a cybersecurity engineer at a financial services company. We had a web application that handled sensitive customer data. During a routine vulnerability assessment, I discovered a critical SQL injection vulnerability in one of the application's search functions. What concerned me the most was that this vulnerability could potentially allow attackers to access sensitive customer data and manipulate our database. Recognizing the severity of the issue, I immediately informed my manager and the development team about my findings and emphasized the importance of fixing this issue as soon as possible. To mitigate the risk in the short term, I worked with the development team to implement input validation and parameterized queries for the affected search function. This significantly reduced the risk of an attacker exploiting the SQL injection and buying us more time for a comprehensive solution. For the long-term fix, I collaborated with the development team to review the entire application for similar vulnerabilities. We ended up finding a few other instances of potential SQL injections, which we also fixed using the same approach as before. To prevent such issues from reoccurring, I led a training session for the development team on secure coding practices, focusing on avoiding common security pitfalls like SQL injections. In the end, our collaborative efforts not only fixed the immediate vulnerability but also strengthened the overall security of the application and increased the development team's awareness of secure coding practices.

51

Suppose you detected a possible vulnerability in your system that could lead to a potential security breach. What steps would you take to assess and mitigate the risk?

Reference answer

To assess and mitigate the risk, I would first isolate the affected system to prevent further exploitation. Then, I would conduct a thorough vulnerability assessment to understand the scope and impact. Next, I would prioritize the risk based on severity and exploitability, implement a patch or workaround, and verify the fix. Finally, I would document the incident and update security policies to prevent recurrence.

52

How do you detect suspicious activity in a cloud account?

Reference answer

I would detect suspicious activity by aggregating and analyzing logs from multiple sources: CloudTrail for API activity, VPC Flow Logs for network traffic, and GuardDuty or similar threat detection services. I would set up centralized logging with a SIEM (e.g., Splunk, ELK) and create alerts for known attack patterns: unusual API calls from unfamiliar locations, IAM privilege escalation attempts, creation of new resources outside standard patterns, large data exports, failed login attempts, and changes to security group rules or IAM policies. I would also implement anomaly detection based on baseline behavior, using machine learning services where available. Regular threat hunting and review of security findings would be part of the process.

53

Define Forward Secrecy, and how does it work?

Reference answer

Forward secrecy is also called as Perfect forward secrecy. It is a method to assure that all the transactions sent over the web are secure and safe. This method blocks a hacker from accessing the data that is sent over the internet. This method provides safety and security for the company and the user.

54

What is social engineering?

Reference answer

Social engineering is a type of attack that uses psychological manipulation to trick individuals into revealing sensitive information.

55

How do you ensure secure configuration management for cloud-based applications?

Reference answer

In my experience, ensuring secure configuration management for cloud-based applications involves several best practices and techniques. My approach includes: 1. Using secure templates: I start by using pre-configured, secure templates provided by the cloud service provider. These templates follow industry best practices and reduce the risk of misconfigurations. 2. Implementing strong access controls: I make sure to implement proper access controls, such as role-based access control (RBAC), to restrict access to sensitive resources and minimize the risk of unauthorized access. 3. Regularly auditing configurations: I conduct periodic audits of the configurations to identify any deviations from the established security baseline. This helps me detect misconfigurations and fix them promptly. 4. Automating configuration management: I leverage tools like AWS Config, Azure Policy, or Google Cloud's Config Validator to automate the process of monitoring and enforcing security configurations. 5. Continuous monitoring and logging: I enable logging and monitoring for all cloud resources to track changes and detect any unauthorized activities. By following these practices, I ensure that cloud-based applications are securely configured and maintained throughout their lifecycle.

56

What is a rootkit?

Reference answer

A rootkit is a type of malware that hides itself and other malicious programs from the operating system and security software.

57

How are hashing and encrypting different? What about hashing and salting?

Reference answer

The easiest way to remember the difference is that encryption protects data while it's moving, and hashing protects data while it's stored. Encryption is a two-way function. It scrambles data, so it can't be read without the key. Hashing also scrambles data but with a different intent. Because hashed data is stored, there's no 'decoder ring,' making it a one-way function. Salting is done in addition to hashing. When you salt the hash, you add additional, random characters to the hash to make it even harder to decode.

58

Walk through a whiteboard scenario for your environment of choice (Win/Linux) in which compromising the network is the goal without use of social engineering techniques (phishing for credential harvesting, etc).

Reference answer

For a Linux environment: I would first scan the network for open ports and services using tools like nmap. Then, identify vulnerable services (e.g., outdated SSH or SMB). Exploit a known vulnerability (e.g., CVE in a web application) to gain initial access. Use privilege escalation techniques (e.g., kernel exploits, misconfigured sudo) to gain root. Then, move laterally by dumping credentials (e.g., from /etc/shadow or memory) and using SSH keys to access other hosts, ultimately compromising critical servers.

59

What do you mean by honeypots?

Reference answer

Honeypots are attack targets that are set up to see how different attackers attempt exploits. Private firms and governments can utilize the same concept to evaluate their vulnerabilities, which is widely used in academic settings.

60

What is the OSI model?

Reference answer

The OSI model is a conceptual framework that standardizes network communication into seven layers: Physical (transmission of raw bits), Data Link (framing and MAC addresses), Network (routing and IP addresses), Transport (reliable data delivery), Session (session management), Presentation (data encoding/encryption), and Application (user services). It helps in understanding and troubleshooting network interactions.

61

How do you manage identity and access management (IAM) in a cloud environment?

Reference answer

I manage IAM by implementing strict role-based access control (RBAC) policies using tools like AWS IAM and Azure AD. Regular audits and continuous monitoring ensure compliance and quickly address any unauthorized access attempts.

62

What is SYN/ACK and how does it work?

Reference answer

SYN/ACK is a flag in TCP packets used in the three-way handshake. A SYN (synchronize) packet is sent by the client to initiate a connection. The server responds with a SYN-ACK packet, which acknowledges the client's SYN and synchronizes its own sequence number. The client then sends an ACK (acknowledge) packet to complete the handshake and establish the connection.

63

How do you ensure that stakeholders who may not be knowledgeable about cyber security understand the importance of investing in security measures?

Reference answer

One of my key responsibilities as a Cyber Security Engineer is to ensure that everyone in the organization understands the importance of investing in security measures, regardless of their technical background. I believe that effective communication and collaboration are critical in achieving this goal. In the past, I've found that using simple analogies and real-world examples can be particularly helpful in explaining complex cyber security concepts to non-technical stakeholders. For instance, I might compare a company's network to a home with several doors and windows, and explain that investing in security measures is like installing strong locks and an alarm system to protect the home. I would then discuss recent high-profile security breaches and their financial and reputational impacts on the affected organizations, so the stakeholders can grasp the potential risks of not implementing proper security controls. To ensure stakeholders are more receptive to my recommendations, I also strive to listen to their concerns and tailor my explanations to address their specific needs and priorities. By doing so, I'm able to present a compelling case for investing in cyber security measures that aligns with their overall business goals and objectives. I believe that fostering a collaborative relationship with stakeholders is crucial for both understanding their perspectives and successfully conveying the importance of a strong cyber security posture.

64

What is a certificate authority and how does it work?

Reference answer

A certificate authority (CA) is a trusted entity that issues digital certificates, which verify the identity of a website or organization. The CA signs the certificate with its private key, allowing clients to verify it using the CA's public key.

65

Describe a situation where you had to convince stakeholders to invest in a security initiative they were initially resistant to.

Reference answer

Our development team was resistant to implementing automated security scanning in our CI/CD pipeline because they were concerned about deployment delays. I understood their pressure to deliver features quickly, so I proposed a pilot program with our least critical application first. I presented data showing that fixing security issues in production costs 10 times more than addressing them during development. I worked with the dev team to configure the scanning tools to minimize false positives and created an exception process for urgent deployments. After the pilot showed we could maintain deployment velocity while catching critical vulnerabilities early, the team became advocates for expanding the program. Within six months, we had security scanning across all applications, and our production security issues decreased by 75%.

66

Explain what traceroute is.

Reference answer

Traceroute is a network diagnostic tool used to trace the path that packets take from a source to a destination across an IP network. It works by sending packets with incrementally increasing Time-To-Live (TTL) values, causing each router along the path to send back an ICMP Time Exceeded message. The tool displays the list of routers (hops) and the round-trip time for each hop.

67

What is a firewall?

Reference answer

A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.

68

How do you assess the security posture of third-party cloud service providers?

Reference answer

I assess the security posture of third-party cloud service providers by reviewing their security certifications and compliance reports, such as SOC 2 and ISO 27001. Additionally, I conduct regular security audits and assessments to ensure they meet our stringent security standards.

69

How do you ensure secure software development practices in cloud applications?

Reference answer

I ensure secure software development practices by implementing secure coding standards and conducting regular code reviews. Additionally, I integrate automated security testing tools into our CI/CD pipelines to identify and address vulnerabilities early in the development process.

70

How do you elevate permissions?

Reference answer

Elevating permissions means gaining higher-level access on a system, typically from a standard user to administrator (e.g., root on Linux or Administrator on Windows). This can be done legitimately by entering the correct credentials or exploiting vulnerabilities (e.g., misconfigured sudo, kernel exploits, weak file permissions). In a security context, it is often a goal during penetration testing to gain full control.

71

What is penetration testing?

Reference answer

Penetration testing is a simulated cyber attack on a system or network to test its defences and identify potential vulnerabilities.

72

What is GDPR?

Reference answer

GDPR (General Data Protection Regulation) is a European Union law that governs the protection of personal data.

73

How does AI affect cyber threats?

Reference answer

Cybersecurity can be made better or worse by AI. Although it assists in the quicker detection and repulsion of attacks, it is also exploited by attackers who use it to create more sophisticated and sinister threats.

74

What is a Distributed Denial of Service attack (DDoS)?

Reference answer

A denial of service (DoS) is a cyber attack against an individual computer or website aimed at denying service to intended users. Its purpose is to interfere with the organization's network operations by denying her access. Denial of service is usually achieved by flooding the target machine or resource with excessive requests, overloading the system and preventing some or all legitimate requests from being satisfied.

75

What are the different authentication types?

Reference answer

There are several types of authentication methods that are used to verify the individual's identity by accessing systems or resources. Here are some common types of authentication:

76

Describe a time when you had to troubleshoot a security issue with a system and identify the root cause of the problem. – Situation: security issue in a system – Task: responsibility to troubleshoot the issue – Action: procedure used to identify the root cause of the problem – Result: outcome of identifying the root cause and resolving the issue

Reference answer

Situation: A server was experiencing repeated unauthorized login attempts. Task: I was responsible for troubleshooting the issue. Action: I analyzed authentication logs, identified a pattern of brute-force attacks, and traced the source IP to a compromised account. Result: I blocked the IP, reset the compromised credentials, and implemented account lockout policies, which stopped the attacks.

77

How does a firewall work?

Reference answer

A firewall monitors and controls incoming and outgoing network traffic based on predetermined security rules. It can block or allow traffic based on IP addresses, ports, and protocols.

78

Which one for DNS?

Reference answer

DNS typically uses port 53 for both TCP and UDP. UDP is used for standard queries and responses, while TCP is used for zone transfers and when responses exceed 512 bytes (or with EDNS0).

79

What do you mean by Phishing?

Reference answer

Phishing is a sort of cybercrime in which the sender appears to be a legitimate entity such as PayPal, eBay, financial institutions, or friends and coworkers. They send an email, phone call, or text message to a target or target with a link to convince them to click on the link. This link will take users to a fake website where they will be asked to enter sensitive information such as personal information, banking and credit card information, social security numbers, usernames, and passwords. By clicking the link, malware will be installed on the target machines, allowing hackers to remotely control them. You can protect yourself from phishing attacks by following these guidelines: - Don't give out important information on websites you don't know. - Check the site's security. - Make use of firewalls. - Use Toolbar for Anti-Phishing

80

Explain Phishing and how to prevent it.

Reference answer

Phishing is a type of cyber attack where attackers impersonate trusted entities (such as banks, companies or services) to trick users into revealing sensitive information like passwords, credit card details or personal data. It is usually carried out through fake emails, messages or websites that appear legitimate. How to prevent phishing: - Download software only from trusted and official sources. - Avoid clicking on suspicious links or sharing personal information on unknown websites. - Always verify website URLs before entering login credentials. - If an email looks suspicious, contact the sender directly using a separate communication method instead of replying. - Be cautious about sharing personal details on social media platforms. - Avoid using unsecured public Wi-Fi for sensitive transactions.

81

How would you use CI/CD to improve security?

Reference answer

I would integrate security into the CI/CD pipeline by: adding static application security testing (SAST) tools (e.g., SonarQube) to scan code for vulnerabilities, dynamic application security testing (DAST) for running applications, software composition analysis (SCA) for open-source dependencies, container scanning for Docker images, and infrastructure-as-code scanning. I would also enforce automatic code review, run security tests, and block builds that fail security checks.

82

Differentiate XSS from CSRF.

Reference answer

XSS (Cross-Site Scripting) is a vulnerability where an attacker injects malicious scripts into a web page, which then executes in the victim's browser, often to steal cookies or session data. CSRF (Cross-Site Request Forgery) is an attack where a malicious website tricks a victim's browser into making an unwanted request to a trusted site where the victim is authenticated, leading to unauthorized actions. XSS targets the user's browser, while CSRF targets the user's authenticated session.

83

What is a security orchestration, automation, and response (SOAR) solution?

Reference answer

A SOAR solution is a security solution that automates and streamlines incident response processes to improve efficiency and effectiveness.

84

What is cross-site scripting (XSS) and how can it be mitigated?

Reference answer

XSS is an attack where malicious scripts are injected into web pages. Mitigation includes output encoding, input validation, and using Content Security Policy (CSP).

85

How do you implement zero trust architecture in an organization?

Reference answer

Zero trust is based on the principle of never trust, always verify. It involves micro-segmentation, multi-factor authentication, continuous monitoring, and strict identity controls. Every request is verified regardless of its origin.

86

What is a managed security service provider (MSSP)?

Reference answer

An MSSP is a third-party provider that offers security services, such as monitoring and incident response, to customers.

87

What are the differences between HIDS and NIDS?

Reference answer

A Host IDS (HIDS) and a Network IDS (NIDS) are Intrusion Detection Systems. However, the HIDS can only be set up on a particular device or host, where it will monitor the traffic of this device or host and any suspicious activities. On the other hand, the NIDS is set up on a network where it monitors all the traffic and suspicious activities of all devices connected to the entire network.

88

Explain how you would investigate a suspected data exfiltration incident.

Reference answer

My first priority would be to preserve evidence while containing any ongoing exfiltration. I'd immediately work with the network team to capture network traffic around the suspected compromised systems and preserve disk images before any remediation. I'd analyze network logs for unusual outbound connections, particularly large data transfers or connections to known malicious infrastructure. I'd examine endpoint logs for file access patterns, looking for bulk file operations or access to sensitive directories outside normal business hours. Using tools like Volatility for memory analysis and timeline analysis tools, I'd reconstruct the attacker's actions to understand what data was accessed and when. I'd correlate this with data loss prevention tools if available. Throughout the investigation, I'd document everything meticulously and prepare preliminary findings for legal and compliance teams while determining the scope of compromised data for breach notification requirements.

89

What is the Blowfish algorithm?

Reference answer

Blowfish is an encryption technique developed by Bruce Schneier in 1993 as an alternative to the DES encryption technique. It is considerably faster than DES and provides excellent encryption speed even though no effective cryptanalysis techniques have been discovered so far. It was one of the first secure block ciphers to be patent-free and therefore freely available to everyone. - Block size: 64 bits - keys: variable size from 32-bit to 448-bit - Number of subkeys: 18 [P array] - Number of rounds: 16 - Number of replacement boxes: 4 [each with 512 entries of 32 bits]

90

How does a rootkit work, and how would you detect it?

Reference answer

rootkit is a type of malicious software that enables hackers to gain unauthorized access to one's system. It attempts to conceal itself and can assume root or admin privileges on computers it infects to tamper with files contained within them.

91

What ethical considerations do you think are important when implementing AI in security?

Reference answer

Key ethical considerations include ensuring transparency in AI decision-making to avoid biased outcomes, protecting user privacy when collecting data for model training, and establishing accountability for AI-driven actions. Candidates should also emphasize the need for human-in-the-loop systems to prevent over-reliance on automation and to address potential misuse of AI by adversaries.

92

Explain Zero Trust Model

Reference answer

Zero Trust is a security framework that assumes no user or device should be trusted by default, whether inside or outside the network. It requires strict identity verification and continuous authentication before granting access to resources, reducing the risk of unauthorized access. - Follows the principle of “never trust, always verify” - Uses multi-factor authentication (MFA) and least privilege access - Continuously monitors user and device activity

93

In a hypothetical attack, a system under your responsibility is compromised, and unauthorized users gain access to private data. How would you identify the source of the breach, contain the situation and restore system integrity?

Reference answer

I would first isolate the compromised system from the network to contain the breach. Then, I would analyze logs and forensic evidence to identify the source and entry point. After identifying the source, I would remove the threat, patch vulnerabilities, and restore the system from a clean backup. Finally, I would conduct a post-incident review to improve security measures.

94

Can you discuss your experience with encryption technologies in the cloud?

Reference answer

In my previous role, I implemented AES-256 encryption for data at rest and used RSA for secure key exchange. Additionally, I leveraged AWS KMS for centralized key management, ensuring robust encryption practices across our cloud infrastructure.

95

Can you walk us through your process for handling a potential security breach?

Reference answer

Handling a potential security breach is a high-pressure situation, and having a clear, well-defined process is crucial. In my experience, I've found that the following steps are essential for effectively managing a potential breach: 1. Identify the incident: The first step is to recognize that a security breach may have occurred. This could involve detecting unusual activity, such as unexpected network traffic or unauthorized access attempts, or receiving a report from an employee or external source. 2. Contain the breach: Once the incident has been identified, it's important to contain it as quickly as possible. This could involve isolating affected systems, blocking malicious IP addresses, or changing passwords and access keys. 3. Assess the impact: After containing the breach, it's essential to determine the scope and impact of the incident. This involves identifying the affected systems and data, as well as determining if any sensitive information has been compromised. 4. Investigate the cause: Next, it's crucial to understand how the breach occurred, which may involve reviewing logs, analyzing malware or attack vectors, and interviewing staff members. 5. Remediate and recover: With the cause identified, appropriate steps should be taken to remediate the issue and prevent future occurrences. This may include patching vulnerabilities, updating software, or implementing new security controls. Additionally, affected systems and data should be restored to their pre-breach state. 6. Communicate and report: Finally, it's important to communicate the incident to relevant stakeholders, such as management, employees, and customers. This includes providing updates on the situation, as well as any necessary steps they should take. Depending on the severity of the breach, reporting to regulatory bodies or law enforcement may also be required.

96

What is phishing?

Reference answer

Phishing is a social engineering attack that uses email or messaging to trick individuals into revealing sensitive information.

97

Explain what SNMP is.

Reference answer

SNMP stands for simple network management protocol, which is considered an internet standard protocol and application layer protocol. The SNMP is used to collect and organize information for managed devices on IP networks. It's also used to modify that information so you can change the device's behavior.

98

What is penetration testing as a service?

Reference answer

Penetration testing as a service is a managed service that provides recurring penetration testing to identify vulnerabilities and improve security posture.

99

Is DNS monitoring important?

Reference answer

DNS has an important role in how end users in a company connect with the internet. Each connection made to a domain by the devices is recorded in the DNS logs. Reviewing DNS traffic between the client and local devices' recursive resolver could disclose a lot of important analysis.

100

How would you prevent identity theft? Mention the steps you'd use.

Reference answer

To prevent identity theft, I'd start with ensuring that all company passwords are strong, unique, and hard to break. After that, I'd use specialized security solutions such as encrypting data files including sensitive information like customer data, credit card information, and social security numbers, and updating system networks.

101

What is the importance of forensics in cybersecurity?

Reference answer

When it comes to understanding the specifics of a cyber attack and their respective origins, forensics is of utmost significance. This data can prevent future intrusions as well as act as evidence during court cases.

102

Define Cloud Security

Reference answer

Cloud security refers to the practices and technologies used to protect data, applications and services hosted in cloud environments. It ensures that cloud resources remain secure from unauthorized access and cyber threats. - Protects platforms like AWS, Azure and Google Cloud - Includes encryption, identity management and access control - Helps maintain data confidentiality and availability

103

What is NIST?

Reference answer

NIST (National Institute of Standards and Technology) is a non-regulatory agency of the US government that provides guidelines, standards, and best practices for information security.

104

Have I played CTF?

Reference answer

This is a question asking about personal experience with Capture The Flag (CTF) competitions. A candidate might answer: 'Yes, I have participated in CTF competitions, which have helped me develop practical skills in reverse engineering, web exploitation, cryptography, and forensics.'

105

What is a block cipher?

Reference answer

A block cipher is an encryption method that converts plaintext into ciphertext by processing data in fixed-size blocks (such as 64-bit or 128-bit blocks) using a secret key. Each block is encrypted separately according to a specific algorithm, ensuring secure data transformation. - Common modes of operation include ECB (Electronic Codebook) and CBC (Cipher Block Chaining). - Provides stronger security compared to simple encryption methods when used with proper modes. - Widely used in modern encryption standards like AES.

106

How Frequently Do You Perform Patch Management?

Reference answer

Patches are necessary to prevent security breaches, and patch management is a vital part of upgrading and securing apps, software, and operating systems. The frequency with which you should perform management depends on the unique components of your security infrastructure as well as industry-specific regulatory requirements (HIPAA, for example, has particular stipulations for patch management in healthcare settings). As a rule of thumb, you should conduct antivirus updates weekly, and database patches should be installed quarterly in confluence with the patch release cycle. Vital security patches should be implemented within days of release after testing has been done to ensure no disruption to systems and applications. Daily patch reports consisting of inventory scans can help verify that all recent updates are installed.

107

What is the difference between Governance, Risk and Compliance?

Reference answer

Governance refers to the overall framework and policies that guide an organization's security strategy and decision-making. Risk involves identifying, assessing, and mitigating potential threats to the organization's assets. Compliance ensures adherence to laws, regulations, and industry standards (e.g., GDPR, HIPAA). Together, GRC aligns security objectives with business goals and regulatory requirements.

108

What's the difference between hashing and encryption?

Reference answer

Hashing is a one-way function that produces a fixed-size output (hash) from input data. It is deterministic but irreversible, meaning you cannot recover the original input from the hash. Hashing is used for integrity checks, password storage, and message authentication. Encryption is a two-way function that transforms data using a key. Encrypted data can be decrypted back to its original form using the correct key. Encryption is used for confidentiality.

109

Explain the purpose of input validation in secure coding.

Reference answer

Input validation ensures that user input meets expected formats and constraints, preventing injection attacks like SQL injection or XSS.

110

If I hand you a repo of source code to security audit what's the first few things you would do?

Reference answer

First, I would clone the repo and run automated security scanning tools (e.g., SAST, dependency checkers). Then, I would review the project's README and configuration files to understand the architecture. I would check for hardcoded secrets, look at the dependencies for known vulnerabilities, examine authentication and authorization logic, and then manually review high-risk areas like input handling and data storage.

111

Tell me about a time when you made a mistake that impacted security. How did you handle it?

Reference answer

During a firewall rule update, I accidentally created a rule that allowed broader network access than intended, essentially creating a gap in our network segmentation for about 2 hours before it was caught during a routine review. I immediately took ownership of the error, documented exactly what happened, and worked with the network team to correct the configuration. I then conducted a thorough analysis to ensure no unauthorized access had occurred during that window. To prevent similar issues, I implemented a peer review process for all firewall changes and created a checklist for network configuration updates. I also presented the incident and lessons learned to our security team during our next monthly meeting. While it was an uncomfortable situation, it led to process improvements that have prevented similar errors.

112

Code review a project and look for the vulnerability.

Reference answer

This is a practical task. I would review the code for common vulnerabilities like: SQL injection (e.g., string concatenation in queries), XSS (e.g., unsanitized user input in HTML), insecure deserialization, hardcoded credentials, improper error handling revealing stack traces, use of deprecated or weak cryptographic functions, and missing input validation. I would also check for logic flaws and privilege escalation issues.

113

What is the role of SSL/TLS in securing network communications?

Reference answer

The role of SSL/TLS in securing network communications is quite important. I like to think of SSL/TLS as a security layer that helps protect sensitive data transmitted over a network. SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are cryptographic protocols that provide data integrity, authentication, and confidentiality for network communications. In my experience, SSL/TLS is most commonly used to secure communication between web browsers and web servers. When a website uses SSL/TLS, the URL starts with 'https://' instead of 'http://', indicating that the connection is encrypted. The SSL/TLS protocol works by establishing an encrypted connection between the client and server using a process called the SSL/TLS handshake. During this handshake, the client and server agree on the encryption algorithm and exchange cryptographic keys, ensuring that the data transmitted between them is secure and cannot be intercepted or tampered with by third parties.

114

What is a security awareness program?

Reference answer

A security awareness program is a systematic approach to educating employees about security best practices and risks.

115

What is a man-in-the-middle (MITM) attack?

Reference answer

A MitM attack is a type of attack that occurs when an attacker intercepts communication between two parties to steal or modify data.

116

How do you prioritize vulnerabilities after a scan?

Reference answer

I prioritize vulnerabilities based on CVSS scores, exploitability, and asset criticality. A critical vulnerability on a production server gets higher priority than the same issue on a test machine. I also review vendor advisories and active exploits in the wild.

117

What is the difference between HIDS and NIDS?

Reference answer

- HIDS: This intrusion detection system sees the host itself as a whole world. It can be a computer (PC) or a server that can act as a standalone system and analyze and monitor its own internals. It works by looking at the files/data coming in and out of the host you're working on. It works by taking existing file system snapshots from a previously taken file system and comparing them to each other. If they are the same, it means the host is safe and not under attack, but a change could indicate a potential attack. - NIDS: This system is responsible for installation points across the network and can operate in mixed and hybrid environments. Alerts are triggered when something malicious or anomalous is detected in your network, cloud or other mixed environments.

118

How do you secure a hybrid work environment?

Reference answer

By using VPNs, enforcing endpoint detection and response, applying multi-factor authentication, and enabling cloud security tools. Employee awareness training is also critical to reduce phishing risks.

119

What's the difference between Diffie-Hellman and RSA?

Reference answer

Diffie-Hellman is a key exchange protocol that allows two parties to securely establish a shared secret over an insecure channel, primarily used for symmetric key agreement. RSA is an asymmetric encryption and digital signature algorithm that uses a public-private key pair for encryption/decryption and signing. Diffie-Hellman does not provide authentication by itself, while RSA can be used for both encryption and digital signatures.

120

Can you discuss a challenging cloud security project you worked on and how you overcame obstacles?

Reference answer

In a recent project, we faced a significant challenge with securing a multi-cloud environment. By implementing a unified security policy and leveraging automation tools, we successfully mitigated risks and ensured compliance across all platforms.

121

How does an active directory work?

Reference answer

Active Directory (AD) is a directory service by Microsoft that manages network resources, users, and permissions. It works by storing information about objects (users, computers, groups) in a hierarchical database, using protocols like LDAP, Kerberos for authentication, and DNS for service location. Domain controllers authenticate users and enforce security policies across the domain.

122

Explain how you would build a web site that could secure communications between a client and a server and allow an authorized user to read the communications securely.

Reference answer

I would build the website with HTTPS using TLS to encrypt communications between client and server. To allow an authorized user to read the communications securely, I would implement end-to-end encryption (E2EE) where messages are encrypted on the client side with the recipient's public key and decrypted only on the authorized user's device. The server would only store encrypted data, ensuring it cannot read the content. Authentication would be handled via strong password hashing and multi-factor authentication.

123

What is a Traceroute?

Reference answer

I've used Traceroute to monitor and assess where connections break in company packet path systems. Traceroute helps me identify areas of failure in packet pass-throughs.

124

Write an LRU Cache.

Reference answer

View answer.

125

What is the difference between hashing and encryption?

Reference answer

| Hashing | Encryption | |---|---| | Converts data into a fixed-length hash value representing the original information | Converts data into an unreadable format (ciphertext) using a key | | Used for fast data retrieval and data integrity verification | Used to ensure confidentiality of data | | One-way process; original data cannot be recovered | Two-way process; data can be decrypted back to original form | | No key is used for reversing the output | Requires a key for both encryption and decryption | | Output is always fixed in length | Output length varies and usually increases with input size | | Commonly used for password storage and digital signatures | Commonly used in secure communication and online transactions |

126

How can Huru.ai boost my interview prep compared to traditional studying?

Reference answer

Huru.ai delivers unlimited, realistic practice with immediate, actionable AI feedback. You'll spot and fix weak spots fast—plus, build confidence in high-pressure environments.

127

Describe a time when you had to work with a difficult team member or department to implement security controls.

Reference answer

I was tasked with implementing endpoint detection and response (EDR) tools across our organization, but the IT operations team was concerned about performance impact and pushed back on the deployment. The ops manager was particularly skeptical and saw it as unnecessary monitoring. I scheduled one-on-one meetings to understand their specific concerns and discovered they had bad experiences with previous security tools that slowed down systems. I worked with the EDR vendor to set up a test environment where we could measure actual performance impact and invited the ops team to participate in tuning the solution. I also showed them how the tool could help with their troubleshooting by providing detailed endpoint activity data. By involving them in the solution design and demonstrating tangible benefits for their work, I turned the strongest opponent into a champion for the project.

128

Name the different layers of the OSI model.

Reference answer

OSI stands for Open Systems Interconnection and there are 7 layers in the OSI model. These are: - Physical layer - Datalink layer - Network layer - Transport layer - Session layer - Presentation layer - Application layer

129

How do you secure an enterprise Active Directory?

Reference answer

Key steps include enabling tiered administration, enforcing strong password policies, monitoring privileged accounts, implementing Group Policy security settings, and enabling advanced auditing. Tools like Microsoft ATA or Defender for Identity add an extra layer of protection.

130

Is Encryption Different From Hashing?

Reference answer

Encryption is a two-way function in which plaintext is converted into illegible ciphertext and then restored to its original plaintext form using a key. Hashing, on the other hand, is a keyless one-way function that converts information into a hash key. This hash key cannot be reversed, meaning that the original information is irretrievable.

131

Explain to me what a sniffing attack is.

Reference answer

A sniffing attack is similar to stealing or intercepting data. The attacker does this by using a sniffer, such as Wireshark, to capture network traffic. If the data isn't encrypted when it's being transferred across the network, the attacker can read the data in the network packet using the sniffer.

132

What are the differences between SSL and TLS? Which one is more secure?

Reference answer

Transport Layer Security (TLS) and Secure Sockets Layer (SSL), are cryptographic protocols that establish secure connections over a network. TLS is the successor to SSL, with newer versions addressing vulnerabilities in SSL. TLS is generally more secure than SSL as it offers more robust encryption algorithms, supports modern cryptographic algorithms, and provides better security configurations.

133

What Is Shoulder Surfing?

Reference answer

Should surfing is a method of data theft by which a bad actor peers over the shoulder of a target in order to steal confidential information like passwords and PIN numbers that can later be used to initiate a cyberattack. Like phishing, shoulder surfing is a social engineering technique—meaning it belongs to a class of information security attacks that rely on psychological manipulation to extract confidential information or influence victims to perform actions counter to their best interests.

134

What are the ethical considerations in cybersecurity?

Reference answer

i) Respecting and safeguarding individual details is vital. ii) Confidentiality:It is essential to be honest about security procedures in addition to breaches incase. iii) Integrity: At what time things go wrong, someone ought to acknowledge accountability for the security steps. iv) Equality: A uniform maximum defense ought to be given to everyone.

135

What is Public Key Infrastructure?

Reference answer

A Public Key Infrastructure or PKI, is the governing authority behind the issuance of digital certificates. Protect sensitive data and give users and systems unique identities. Therefore, communication security is ensured. The public key infrastructure uses keys in public-private key pairs to provide security. Public keys are vulnerable to attacks, so maintaining public keys requires a healthy infrastructure.

136

What is the CIA Triad?

Reference answer

When it comes to network security, the CIA Triad is one of the most important models developed to guide information security policy within an organization. CIA stands for: - Confidentiality - Integrity - availability

137

Should you encrypt all data at rest?

Reference answer

Yes, encrypting all data at rest is a best practice to protect against unauthorized access to storage media. However, it must be balanced with performance and usability considerations. Sensitive data should always be encrypted, and for non-sensitive data, encryption is still recommended as a defense-in-depth measure, though it may be optional depending on the threat model.

138

Explain how OAuth works.

Reference answer

OAuth is an authorization framework that allows a third-party application to obtain limited access to a user's resources on another service without exposing the user's credentials. It works by having the user authorize the third-party application, which then receives an access token from the authorization server. This token is presented to the resource server to access the protected resources.

139

How would you implement network segmentation and micro-segmentation in a cloud environment?

Reference answer

“I'd implement a multi-layered segmentation strategy starting with VPC-level isolation for different environments and business units. Within VPCs, I'd use subnets to separate different application tiers and implement security groups as application-level firewalls. For micro-segmentation, I'd leverage application security groups in Azure or security group rules in AWS that reference other security groups, allowing me to define policies based on application function rather than IP addresses. In containerized environments, I'd use Kubernetes network policies to control pod-to-pod communication. I'd also implement a zero-trust network model where possible, requiring authentication and authorization for all network communications. The key is making segmentation policies maintainable through automation and infrastructure as code, so they can evolve with the application architecture.”

140

Explain the future trends in cybersecurity.

Reference answer

i) Intangible burglar alarm systems and automated brainpower: All of this will enable a person to identify potential problems, and work them out. ii) Principle of no trust: forever check, do not just believe. iii) Quantum cryptography will protect data from quantum-attacking machines. iv) Security of the Internet of Things will give better experience in defending interconnected devices. v) Cloud safety includes methods to protect data, which is kept there in various forms.

141

Differentiate between spear phishing and phishing?

Reference answer

Spear phishing is a type of phishing assault that targets a small number of high-value targets, usually just one. Phishing usually entails sending a bulk email or message to a big group of people. It implies that spear-phishing will be much more personalized and perhaps more well-researched (for the individual), whereas phishing will be more like a real fishing trip where whoever eats the hook is caught.

142

Explain data leakage.

Reference answer

Data leakage, also known as data loss or breach, refers to the unauthorized disclosure or exposure of sensitive or confidential information. It occurs when data is accessed, transmitted, or disclosed to unintended recipients, either internally or externally, without proper authorization. It can happen through various means, including accidental incidents, deliberate actions by insiders, or external attacks by hackers or cybercriminals.

143

How do you approach risk assessment in a cloud environment?

Reference answer

I start by conducting a thorough risk assessment using tools like AWS Trusted Advisor and Azure Security Center. This helps identify vulnerabilities and prioritize them based on potential impact, allowing us to implement targeted mitigation strategies effectively.

144

What is the difference between a threat, vulnerability, and risk?

Reference answer

A threat is a potential attack on an organization's assets, a vulnerability is a weakness in a system that can be exploited, and a risk is the likelihood and potential impact of a threat exploiting a vulnerability.

145

Define encryption and decryption?

Reference answer

Encryption: Encryption is the process of converting readable data (plaintext) into an unreadable format (ciphertext) to protect its confidentiality. Only authorized users with the correct key can convert it back to its original form. It is used to secure data during storage and transmission. - It is a two-way process (data can be decrypted back to plaintext). - The encrypted data size usually increases with the length of input. - It is widely used in secure communication such as online transactions and messaging. Decryption: Decryption is the process of converting encrypted data (ciphertext) back into its original readable form (plaintext) using a cryptographic key. It ensures that only authorized users can access the original information. It is the reverse process of encryption. - It requires a valid key to restore the original data. - It is used to retrieve secure information from encrypted form. - It is essential for accessing protected communication and stored data.

146

What is a VPN?

Reference answer

VPN stands for Virtual Private Network. A virtual private network (VPN) is a technology that creates a secure, encrypted connection over an insecure network like the Internet. A virtual private network is a method of extending a private network using a public network such as the Internet. The name only indicates that it is a virtual "private network". A user may be part of a local area network at a remote location. Create a secure connection using a tunnelling protocol.

147

What tools and technologies do you prefer for cloud security monitoring and incident response?

Reference answer

I prefer using AWS CloudTrail and Azure Security Center for comprehensive monitoring and incident response. Additionally, I leverage SIEM solutions like Splunk for real-time threat detection and automated response, ensuring swift and effective mitigation.

148

How do you prioritize threats identified during threat modeling?

Reference answer

Prioritizing threats involves assessing their potential impact and the likelihood of occurrence. Using a risk matrix can be helpful to visualize which threats require immediate attention based on their severity and probability. Look for answers that demonstrate a balance between analytical skills and practicality. Candidates should be able to articulate a clear strategy for prioritizing and managing threats effectively.

149

Differentiate EDR and XDR

Reference answer

| EDR (Endpoint Detection and Response) | XDR (Extended Detection and Response) | |---|---| | EDR is a security solution focused on monitoring and responding to threats on endpoint devices like laptops, desktops and servers. | XDR is an advanced security solution that integrates data from multiple sources like endpoints, networks, servers and applications. | | It detects and investigates suspicious activity at the device level. | It provides a centralized view of threats across the entire security environment. | | It offers real-time threat detection and response for endpoints only. | It correlates security data from multiple layers for better detection accuracy. | | It is limited to endpoint protection. | It provides broader organization-wide threat detection and response. |

150

Why HMAC is designed in that way?

Reference answer

HMAC is designed with two hash passes (inner and outer padding) to prevent length-extension attacks on Merkle-Damgård hash functions and to provide strong security guarantees. The construction ensures that even if the underlying hash function is partially compromised, the MAC remains secure, and it protects against key recovery attacks.

151

Explain the intricacies of network protocol security.

Reference answer

Here is what network protocol security encompasses: i) Use encryption to protect data when it moves. ii) Verify user identities and device authenticity. iii) Confirm that transmitted data has not been tampered with. iv) Restrict who can access what on a network.

152

What is a subnet and how is it useful in security?

Reference answer

A subnet is a logical subdivision of an IP network, created by applying a subnet mask to an IP address range. In security, subnets are useful for segmenting networks to isolate sensitive systems, controlling traffic flow with firewalls, limiting the blast radius of a breach, and enforcing access control policies based on network boundaries.

153

What are the concepts of PKI?

Reference answer

Public Key Infrastructure deals with digital keys and certificates. It is made up of a certification body (CA), the registration authority (RA), digital certificates, public and private keys, cancellation list of certificates (CRL), and a model of trust.

154

What is HIPAA?

Reference answer

HIPAA (Health Insurance Portability and Accountability Act) is a US law that governs the protection of sensitive health information.

155

Black Hat Hackers vs White Hat Hackers vs Grey Hat Hackers: Are All Illegal?

Reference answer

Black hat hackers use cybersecurity knowledge to gain unauthorized access to networks and systems for malicious or exploitative ends. This type of hacking is illegal. Conversely, white hat hackers—also known as ethical hackers—are hired to evaluate the vulnerabilities of a client's system. Because white hat hackers operate with the permission of their "targets," this activity is legal. Grey hat hackers may search for system vulnerabilities without permission, but instead of exploiting the vulnerability directly may offer to fix the issue for a price. Because the intrusion was not permitted, grey hat hacking is often considered unethical and illegal.

156

What is cloud-based compliance and risk management?

Reference answer

Cloud-based compliance and risk management is a solution that helps organizations manage risk and comply with regulatory requirements in cloud environments.

157

What Are the Response Codes That Can Be Received From a Web Application?

Reference answer

When a client sends a request to a web server, a status code is returned to indicate the response that will occur. HTTP response status codes include: - Informational responses (100–199) - Successful responses (200–299) - Redirection messages (300–399) - Client error responses (400–499) - Server error responses (500–599) Response codes relevant to web application security testing include: 301 (moved permanently), 302 (found—temporary redirect), 400 (bad request), 401 (unauthorized), 403 (forbidden), 404 (not found), 405 (method not allowed), and 500 (internal server error).

158

Can you walk us through your process for identifying and mitigating network vulnerabilities in a large-scale system?

Reference answer

My process begins with asset discovery and network mapping to identify all devices and services. Then, I perform vulnerability scanning using tools like Nessus or Qualys, prioritizing findings by severity. For mitigation, I apply patches, configure firewalls, and implement intrusion detection systems. I also conduct regular penetration testing and review network segmentation to minimize attack surface.

159

Define Traceroute.

Reference answer

Traceroute maps the route that data travels across devices and networks from source to destination. Traceroute uses Internet Control Message Protocol (ICMP) packets to track and record this route and calculates how long the packet takes to hop from router to router. It can also identify points of failure where data was unable to be transferred.

160

How can a firewall protect a network?

Reference answer

A network firewall safeguard data traffic entering and leaving a system according to specified security rules. It acts as a barrier between safe and unsafe sections of a network. Without it, the way a network operates would change and its security lessened compared to if there were no wall at all. Its main task is monitoring ongoing activities to prevent malicious entities from accessing the system. There are threats lurking around which make a firewall necessary as it protects against them.

161

What are the common methods for secure data disposal?

Reference answer

It is possible to destroy, paper files by cutting them up, clean hard drives with programs and cause damage to storage devices as an example of what is in this unwanted data.

162

Can I write a tool that would search our Github repos for secrets, keys, etc.?

Reference answer

Yes, you can write a tool using GitHub's API to clone or search repositories for patterns like API keys, passwords, or tokens. Tools like GitLeaks, TruffleHog, and custom scripts (e.g., using Python with regex) can scan commit history and code for secrets. The tool would report findings and integrate with CI/CD to prevent future leaks.

163

What is a cloud-based security incident response team (SIRT)?

Reference answer

A cloud-based SIRT is a team of security professionals that responds to security incidents in cloud environments to contain and mitigate the impact of the incident.

164

What tools do you use for vulnerability management?

Reference answer

Common tools include Qualys, Nessus, Rapid7, and OpenVAS. These tools help in identifying vulnerabilities across servers, applications, and networks. I also integrate them into SIEM platforms to correlate results with threat intelligence.

165

What is an Eavesdropping Attack?

Reference answer

Eavesdropping occurs when a hacker intercepts, deletes or modifies data sent between two devices. Eavesdropping, also known as sniffing or snooping, relies on unsecured network communications to access data sent between devices.

166

What is SQL injection (SQLi) and what are its variants?

Reference answer

Blind SQli. Error based. Time based. Union-based SQLi. Validation / sanitisation of webforms.

167

What kind of cookie can be used in a spyware attack?

Reference answer

Tracking cookies are most commonly-used in spyware attacks because they can last through multiple sessions, unlike the session cookie which lasts for only one session.

168

Tell me about a time you had to learn a new cloud security technology quickly.

Reference answer

“When our company decided to adopt Kubernetes for our microservices architecture, I had limited container security experience. I knew this was a critical gap since we'd be deploying customer-facing applications. I created a learning plan that included hands-on labs, online courses, and connecting with the Kubernetes security community. Within two weeks, I had set up a test cluster and was experimenting with Pod Security Standards and network policies. I also attended a KubeCon security workshop and started following key security researchers on Twitter. After a month of intensive learning, I was able to design our production security controls and train other team members. My quick ramp-up helped us deploy our first production Kubernetes cluster with robust security controls in place from day one.”

169

What is the Secure Access Service Edge (SASE) model?

Reference answer

The Secure Access Service Edge (SASE) model combines network and security functions delivered as a cloud service, supporting remote and distributed workforces. It integrates capabilities such as secure web gateways, cloud access security brokers, and zero trust network access into a unified cloud-based service.

170

What is the difference between a data leak and a data breach?

Reference answer

A data leak is when unauthorized information is released either through an unauthorized person or because the information was accessed by a hacker. A data breach is part of a cyberattack and involves a cybercriminal attacking a system, server, or email.

171

Would you decrypt a steganography image?

Reference answer

Yes, if I suspect a steganography image contains hidden data, I would attempt to decrypt or extract the hidden message using steganalysis tools (e.g., steghide, zsteg, or custom scripts) by analyzing the image's pixel patterns, metadata, or file structure, provided I have the necessary keys or passwords.

172

What is a cloud-based data loss prevention (DLP)?

Reference answer

Cloud-based DLP is a solution that monitors and controls data in cloud environments to prevent unauthorized data exfiltration and data breaches.

173

Give some examples of asymmetric encryption algorithms.

Reference answer

Asymmetric key cryptography is based on public and private key cryptography. It uses two different keys to encrypt and decrypt messages. More secure than symmetric key cryptography, but much slower. - You need two keys, a public key and a private key. One for encryption and one for decryption. - The ciphertext size is equal to or larger than the original plaintext. - Slow encryption process. - Used to transfer small amounts of data. - Provides confidentiality, authenticity and non-repudiation.

174

What is the MITRE Att&ck framework used for?

Reference answer

Threat Matrix List threats, compare risk & severity.

175

How is pad lock icon in browser generated?

Reference answer

The padlock icon in a browser is generated when a website uses HTTPS with a valid SSL/TLS certificate. The browser verifies the certificate's authenticity, checks for a secure connection (encrypted), and displays the padlock as a visual indicator. The icon may also show additional information (e.g., certificate issuer) when clicked.

176

What is RSA?

Reference answer

The RSA algorithm is an asymmetric encryption algorithm. Asymmetric means that it actually works with two different keys. H. Public and Private Keys. As the name suggests, the public key is shared with everyone and the private key remains secret.

177

What is a cybersecurity risk assessment?

Reference answer

A cybersecurity risk assessment is part of an organization's risk management strategy because it helps them see how their security is performing along with current vulnerabilities and potential risks. A cybersecurity risk assessment also covers the different types of assets owned by a company that may be prone to cyberattacks. These assets can include physical assets such as hardware, laptops, or non-physical assets such as customer data. Companies that use a cyber risk assessment can prioritize addressing those risks based on their importance and the available budget.

178

What are the key differences between Encryption, Encoding, Hashing, Obfuscation, and Signing?

Reference answer

Encryption is for secrecy. Asymmetric: slow, uses "public" and "private" keys. Good for establishing a trusted connection. Symmetric: fast, uses one shared key. Protocols often use asymmetric to transfer symmetric key. RSA (asymmetrical). AES (symmetrical). ECC (asymmetrical). Chacha/Salsa (symmetrical). Encoding is for compatibility. URL encoding, Base64, ASCII encoding. Hashing is for integrity. Fixed length "fingerprints". MD5, SHA1, SHA256. Obfuscation is for hindrance. Superficial changes while preserving functionality. Unnecessary encoding (e.g. Base64), unconventional formatting (e.g. removing all whitespace). Signing is for authenticity. Elliptic curve cryptography. "Stamp" a hash of the data using a private key, verify with corresponding public key.

179

What do you mean by a Null Session?

Reference answer

A null session is an unauthenticated connection to a Windows system that allows access to certain network resources without a username or password. It was commonly used in older Windows systems to share information but could be exploited to gather sensitive data about users, groups and network settings. - Often associated with Windows systems like older server versions. - Can be used for information gathering during security testing. - Modern operating systems restrict or disable null sessions by default for security.

180

How do you manage cryptographic keys?

Reference answer

Assuming that you want to access, you need to create, save and use your cryptographic keys. One must maintain his keys secretively, frequently change them and protect them with tough passwords.

181

If you had to set up supply chain attack prevention, how would you do that?

Reference answer

To prevent supply chain attacks, I would: (1) Implement a software bill of materials (SBOM) for all third-party components. (2) Use vulnerability scanning and integrity checks for all dependencies. (3) Require code signing and verify signatures for all downloaded packages. (4) Use private repositories for trusted components. (5) Perform vendor risk assessments. (6) Implement strict access controls and multi-factor authentication for CI/CD pipelines. (7) Monitor for anomalous behavior in build processes and dependencies.

182

What is a cloud access security broker (CASB)?

Reference answer

A CASB is a security solution that monitors and controls cloud service usage to detect and prevent security threats.

183

Explain the difference between OAuth 2.0 and OIDC.

Reference answer

OAuth 2.0 is an authorization framework that allows third-party applications to obtain limited access to user resources without exposing user credentials. It focuses on access delegation and issues access tokens. OpenID Connect (OIDC) is an identity layer built on top of OAuth 2.0. While OAuth 2.0 handles authorization, OIDC adds authentication by issuing an ID token (a signed JWT) that contains identity claims about the user. OIDC also provides a standardized way to obtain user profile information via the UserInfo endpoint.

184

Which patterns in this snippet could lead to injection or data leaks?

Reference answer

Patterns that could lead to injection include: string concatenation for building SQL queries or commands, direct use of user input in eval() or similar functions, insufficient input validation (especially on free-text fields), and lack of parameterized queries. Patterns that could lead to data leaks include: returning full database objects or sensitive fields (e.g., password hashes, PII) in API responses, verbose error messages that reveal schema or system details, logging sensitive data, and exposing internal IP addresses or server names in response headers or error messages.

185

What Is the Difference Between a Threat, a Vulnerability, and a Risk?

Reference answer

Answering this question calls for a deep understanding of cybersecurity and anyone working in the field should be able to give a strong response. You should expect a follow-up question asking which of the three to focus more on. A simple way to put it: a threat is from someone targeting a vulnerability (or weakness) in the organization that was not mitigated or taken care of since it was not properly identified as a risk.

186

What are the main components of the TCP three-way handshake?

Reference answer

This content does not contain a specific explanation of the TCP three-way handshake.

187

What are the three main steps of endpoint security?

Reference answer

Endpoint security has three major components which are: i) It is all safeguarding devices using antivirus as well as firewalls. ii) It keeps updating software continuously through fixes iii) It involves monitoring devices for any suspicious activities occurring.

188

What is a three-way handshake?

Reference answer

The three-way handshake is the process used by TCP to establish a connection between a client and a server. It involves three steps: first, the client sends a SYN (synchronize) packet to the server. Second, the server responds with a SYN-ACK (synchronize-acknowledge) packet. Third, the client sends an ACK (acknowledge) packet back to the server, confirming the connection is established.

189

What is a cloud-based cloud access security broker (CASB)?

Reference answer

Cloud-based CASB is a solution that monitors and controls cloud service usage to detect and prevent security threats.

190

How do you integrate vulnerability management into CI/CD pipelines?

Reference answer

By embedding automated security scans within the pipeline using tools like Snyk or SonarQube. This ensures that vulnerabilities are identified and addressed before deployment. Security gates help prevent code with critical issues from moving forward.

191

How Do You Differentiate Between Viruses and Worms?

Reference answer

While viruses attach to a file or program, worms exploit network vulnerabilities to enter a network. Viruses only replicate when activated by a host, and will remain dormant in a system until an action is taken to trigger execution. Conversely, worms propagate independently after breaching a system and can spread without human interaction or the assistance of a host.

192

How does email work?

Reference answer

When an email is sent, the sender's email client transfers it to a mail server using SMTP. The server checks the recipient's domain and uses DNS to locate the correct mail server if needed. The email is then delivered to the recipient's mail server, where it is stored until the recipient accesses it using POP or IMAP. If delivery fails, the message is queued and may eventually be returned as undelivered. - SMTP is only used for sending emails, not for retrieving them. - IMAP allows syncing emails across multiple devices, while POP usually downloads them to a single device. - Email servers retry sending queued messages for a certain period before marking them as failed.

193

What are the stages of the cyber kill chain or attack structure for a targeted attack?

Reference answer

Reconnaissance Resource development Initial access Execution Persistence Privilege escalation Defense evasion Credential access Discovery Lateral movement Collection Exfiltration Command and control Impact

194

Tell me about a time you proactively identified a security threat.

Reference answer

"At a previous role with a financial services firm, I discovered a critical vulnerability related to outdated software that could have exposed sensitive customer data. I conducted a thorough risk assessment and collaborated with the IT team to patch the software within 24 hours. This proactive measure not only secured our systems but also prevented potential data breaches, enhancing our security posture. Post-implementation reviews showed zero incidents related to that vulnerability in the following year."

195

What are common mistakes teams make when implementing encryption?

Reference answer

Common mistakes include: using weak or outdated algorithms (e.g., DES, MD5), hardcoding encryption keys in source code or configuration files, failing to rotate keys regularly, not encrypting data in transit as well as at rest, using the same key for encryption and authentication, improper key storage (e.g., in the same database as the data), and not considering performance impacts of encryption on query execution. Another frequent mistake is implementing custom cryptographic functions instead of using well-vetted libraries.

196

What are the concepts of risk assessment?

Reference answer

Risk assessment is the act of identifying and evaluating risks within information systems by recognizing dangers, examining vulnerabilities, and taking action against them.

197

Explain a three-way handshake.

Reference answer

The three-way handshake is a method used in network communication to establish a reliable and secure connection between a client and a server. It involves three steps:

198

What's the difference between IDS and IPS?

Reference answer

IDS stands for intrusion detection system, while IPS stands for intrusion protection system. Both monitor network traffic but protect your systems differently. An IDS analyzes network traffic for suspicious or known signs of trouble. When it flags something, the appropriate people are notified, but traffic to the network does not stop. An IPS also monitors traffic for trouble. However, the IPS stops all traffic when it finds something unusual or suspicious.

199

What is your experience with SIEM tools, and which ones have you used?

Reference answer

I have extensive experience with SIEM (Security Information and Event Management) tools, as they are critical for monitoring, detecting, and responding to security incidents in a timely manner. Throughout my career, I've had the opportunity to work with several SIEM tools, including Splunk Enterprise Security, IBM QRadar, and LogRhythm. In my last role, I was responsible for managing the Splunk Enterprise Security deployment for the company. This involved configuring and fine-tuning the correlation rules, integrating various security tools and data sources, and creating custom dashboards and reports to meet the organization's specific needs. I've found that SIEM tools are invaluable for providing a centralized view of an organization's security posture, enabling security teams to quickly identify and respond to potential threats. By aggregating and correlating data from various sources, SIEM tools can help detect patterns and trends that might otherwise go unnoticed, allowing for a more proactive approach to security.

200

What is the difference between symmetric and asymmetric encryption?

Reference answer

Asymmetric: slow, uses "public" and "private" keys. Good for establishing a trusted connection. Symmetric: fast, uses one shared key. Protocols often use asymmetric to transfer symmetric key.

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