Mock Interview Questions for Security Engineers

1

You're reviewing code for an API endpoint that processes user input. What do you look for?

Reference answer

When reviewing code for an API endpoint that processes user input, I look for: 1) Input validation and sanitization—are there allowlists for expected input types and formats? 2) Injection vulnerabilities—are user inputs concatenated into SQL queries, OS commands, or LDAP queries without parameterization? 3) Authentication and authorization—is the endpoint properly protected? Does it check that the user has permission to perform the action? 4) Data exposure—does the endpoint return more data than necessary? 5) Error handling—does it leak stack traces or internal system details? 6) Rate limiting—is there protection against abuse? 7) Logging—are security-relevant events logged? 8) Use of secure libraries and avoiding deprecated functions.

2

What is a DMZ?

Reference answer

A DMZ (Demilitarized Zone) is a network segment that separates the Internet from an internal network, providing an additional layer of security.

3

How would you build a vulnerability management process for a cloud-first organization?

Reference answer

I would build a vulnerability management process that includes: 1) Asset discovery and inventory—continuously identify all cloud resources (compute, storage, databases, serverless). 2) Automated scanning—integrate vulnerability scanners (e.g., Qualys, Tenable, AWS Inspector) into the CI/CD pipeline and schedule regular scans of running infrastructure. 3) Prioritization—use a risk-based approach considering exploitability, asset criticality, and business impact. 4) Remediation workflows—automate ticketing and assignment to responsible teams with SLA based on severity. 5) Validation—re-scan after remediation to confirm fixes. 6) Reporting—provide dashboards and metrics to leadership on vulnerability trends and remediation progress. 7) Continuous improvement—regularly review and update scanning policies and prioritize based on emerging threats.

4

What is a security incident response team (SIRT)?

Reference answer

A SIRT is a team of security professionals that responds to security incidents to contain and mitigate the impact of the incident.

5

What is SQL Injection and how is it prevented properly?

Reference answer

Focus: Secure coding fundamentals Core Idea: Input handling is architecture, not validation Strong Answers Cover: • Parameterisation vs sanitisation • ORM false sense of safety • Risk reduction at framework level • Long-term maintenance impact

6

What is the difference between host-based signatures and network signatures for detection?

Reference answer

Host-based signatures: Eg changes to the registry, files created or modified. Strings in found in malware samples appearing in binaries installed on hosts. (/Antivirus). Network signatures: Eg checking DNS records for attempts to contact C2 (command and control) servers.

7

What is a man-in-the-middle attack and how can it be prevented?

Reference answer

A man-in-the-middle attack occurs when an attacker intercepts communication between two parties. It can be prevented using encryption, certificate validation, and mutual authentication.

8

What is Zero Trust Architecture?

Reference answer

Zero Trust Architecture moves beyond perimeter-based defenses by assuming no implicit trust and continuously verifying every access request, leveraging strong authentication and micro-segmentation. It enforces continuous authentication and session validation, context-aware access based on user behavior and risk level, and micro-segmentation of access rights to limit lateral movement.

9

What controls reduce SSRF risk in cloud environments?

Reference answer

To reduce Server-Side Request Forgery (SSRF) risk in cloud environments, I would implement the following controls: 1) Validate and sanitize all URLs or IP addresses provided by users, using allowlists of approved domains or IP ranges. 2) Disable unnecessary URL schemes (e.g., file://, gopher://). 3) Use a dedicated HTTP client that restricts redirects and does not follow redirects to internal IPs. 4) Implement network segmentation and firewalls to prevent application servers from reaching internal metadata endpoints (e.g., 169.254.169.254 for cloud metadata). 5) Use instance metadata service v2 (IMDSv2) with session tokens to make SSRF attacks harder. 6) Apply egress network filtering to limit outbound traffic from the application. 7) Regularly scan for SSRF vulnerabilities using automated tools.

10

What is cybercrime? Can you give some examples?

Reference answer

Cybercrime is a type of crime that happens on the internet. Examples include identity theft, hacking of sensitive information online, ransomware, stealing intellectual property, online predators, and business email compromise (BEC).

11

Define the terms virus, malware, and ransomware.

Reference answer

By infecting files and programs on computers, the virus moves across the internet. Among other things, malware is designed to harm computer systems, networks, and servers. The program named ransomware encrypts user files and asks for money in order to give out decryption keys.

12

What's the difference between a threat, vulnerability, and risk?

Reference answer

A threat is a potential problem, but one that hasn't caused damage — yet! An example would be a phishing email. A vulnerability is a weakness in the system that can be exploited by a threat. That can include things like not using SSL or using (and reusing) weak passwords. Risk is the potential damage a vulnerability plus threat can cause. If someone opens a phishing email, clicks the link, and 'resets' their password, how much damage could that cause to your entire system?

13

Explain the role of blockchain in cybersecurity.

Reference answer

In order to enhance online transactions and minimize their vulnerability to fraud, blockchain has been introduced for the very same reason. Henceforth, a shared transaction record store is created by these blocks or units against tempering with them. The records are so kept to maintain integrity within themselves regarding all the activities that have taken place in this chain or series of chronological data. Additionally, correctness of information is checked while dishonesty is controlled hence making this platform open and transparent.

14

What's your experience with SIEM tools and how do you tune them to reduce false positives?

Reference answer

I have extensive experience with Splunk and QRadar, and more recently with cloud-native tools like Azure Sentinel. My approach to reducing false positives starts with understanding our environment's baseline behavior. I spend time analyzing legitimate user and system activities before creating detection rules. I use a tiered alerting system where low-confidence indicators generate logs for investigation, medium-confidence triggers analyst alerts, and high-confidence indicators initiate automated containment actions. In my previous role, I reduced our SIEM false positive rate from 60% to under 15% by implementing user behavior analytics and refining our correlation rules based on six months of baseline data. This allowed our analysts to focus on genuine threats instead of chasing false alarms.

15

What is a security information and event management (SIEM) system?

Reference answer

A SIEM system is a solution that collects, monitors, and analyzes log data from various sources to provide real-time insights into security threats.

16

What's your approach to securing IAM roles across multiple accounts?

Reference answer

My approach is to use a centralized identity provider and a hub-and-spoke model for IAM roles. I would create a dedicated security account (hub) that houses the identity source and manages cross-account roles. In each account (spoke), I would define IAM roles with specific, least-privilege permissions for different functions (e.g., read-only, developer, admin). Trust policies would only allow the hub account or the centralized IdP to assume these roles. I would enforce MFA for role assumption, use conditional access policies based on source IP or device compliance, and implement a process for regular access reviews. All IAM changes would be managed through IaC and CI/CD pipelines to ensure consistency and auditability.

17

What security tools are commonly used for network security?

Reference answer

Network security tools such as firewalls, intrusion detection and prevention systems (IDS/IPS), and network access control (NAC) help monitor and control traffic, blocking unauthorized or malicious activity. Security information and event management (SIEM) systems aggregate logs from multiple sources for real-time analysis and alerting.

18

What do you do to remain up to date on the latest trends and developments in cybersecurity and the ways to breach that security?

Reference answer

Demonstrates candidates' technical skills and knowledge, as well as their willingness to remain current in a constantly evolving field.

19

How do you implement Zero Trust architecture in cloud environments?

Reference answer

“Zero Trust fundamentally changes how we think about network security—instead of trusting anything inside the perimeter, we verify everything. In my current role, I implemented Zero Trust principles using a combination of tools. We used Azure AD Conditional Access to enforce strict identity verification, requiring MFA for all users and implementing risk-based authentication. For network segmentation, I configured micro-segmentation using Azure Network Security Groups and Application Security Groups. We also deployed endpoint detection tools and implemented continuous monitoring with Azure Sentinel to verify device compliance before granting access to resources. The key was starting with our most critical assets and gradually expanding the implementation.”

20

What is a business continuity plan?

Reference answer

A business continuity plan is a set of procedures that outline how an organization will continue to operate during a disaster or major outage.

21

What is the role of patch management in maintaining security?

Reference answer

Patching maintains the timeliness of software and systems. It is the act of addressing malfunctions and such issues in order to avert criminal abuse of previously known flaws.

22

What is a vulnerability assessment?

Reference answer

A vulnerability assessment is a systematic process of identifying and evaluating potential vulnerabilities in a system or network.

23

What do you mean by Forward Secrecy and how does it work?

Reference answer

Forward secrecy is a property of certain key agreement protocols that ensures that the session keys will not be exposed if the server's private key is exposed. Perfect forward secrecy is another name for it (PFS). The "Diffie–Hellman key exchange" algorithm is used to accomplish this.

24

What is PCI-DSS?

Reference answer

PCI-DSS (Payment Card Industry Data Security Standard) is a set of security standards for organizations that handle credit card information.

25

What Is the Difference Between Symmetric and Asymmetric Encryption in Cybersecurity?

Reference answer

Symmetric encryption uses the same key for both encryption and decryption processes, while asymmetric encryption uses different keys, namely a public key for encryption and a private key for decryption. Asymmetric encryption provides a higher level of security by enabling secure communication without the need to exchange secret keys.

26

Can you describe your approach to developing a comprehensive information security strategy?

Reference answer

"At L'Oréal, I started by aligning the security strategy with our corporate goals, conducting a thorough risk assessment to identify critical vulnerabilities. I implemented a multi-layered security framework that addressed both technical and human factors, which involved training staff and enhancing our incident response capabilities. This approach not only reduced our incident response time by 40% but also fostered a culture of security awareness across the organization."

27

Explain risk, vulnerability, and threat.

Reference answer

Vulnerability is a gap in the protection efforts of a system. Threat is when an attacker exploits that weakness. Risk is the measure of potential loss when the vulnerability is exploited by the threat e.g. Default username and password for a server – An attacker can easily crack into this server and compromise it.

28

What is a cloud-based managed security service provider (MSSP)?

Reference answer

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

29

Explain SSL Encryption.

Reference answer

Secure Socket Layer (SSL) provides security for data transferred between web browsers and servers. SSL encrypts the connection between your web server and your browser, keeping all data sent between them private and immune to attack. Secure Socket Layer Protocols: SSL recording protocol.

30

What strategies would you implement for securing mobile applications?

Reference answer

In order that mobile apps become safer, one should: i) Write code that would not crack under common vulnerabilities. ii) Correct security issues through updates. iii) Log users in using strong methods. iv) Encrypt the information stored in the program and sent through it.

31

What Is Cryptography?

Reference answer

Cryptography is a secure communication technique that prevents parties outside of the sender and intended recipient from accessing the contents of a confidential transmission. The process of cryptography uses an algorithm to convert plaintext input into an encrypted ciphertext output. The message can be converted back into readable plaintext by authorized recipients who possess the necessary key.

32

What are the different kinds of data leaks?

Reference answer

Data leaks can be put into three buckets: - Accidental - Intentional - Hacked. Accidental data leaks happen when someone accidentally gives away privileged information. Intentional data leaks happen when someone purposely leaks privileged data. Hacked data leaks happen when the system is breached, and the hackers obtain confidential information.

33

What do you mean by System Hardening?

Reference answer

System hardening is the process of securing a system by reducing its attack surface. The attack surface includes all possible vulnerabilities, such as default passwords, unnecessary services and misconfigured settings, that attackers can exploit. By minimizing these weaknesses, system hardening makes the system more secure and resistant to attacks. - It involves applying security patches and regular system updates. - It includes disabling unused ports, applications and services. - It enforces strong authentication methods and access controls.

34

Explain the difference between HTTP and HTTPS.

Reference answer

HTTP is unencrypted, meaning data is sent in plain text and can be intercepted or modified. HTTPS uses TLS (Transport Layer Security) to encrypt the data between the client and server, providing confidentiality, integrity, and authentication. HTTPS ensures that even if data is intercepted, it cannot be read or tampered with.

35

How does Secure Socket Layer (SSL) work?

Reference answer

SSL lets you keep your data private. What this means is that whatever happens between your browser and a website hackers will not be able to access it because the information is scrambled.

36

What Do You Mean by SQL Injection?

Reference answer

A SQL injection is a type of cyberattack that inserts malicious SQL code via input data to manipulate databases. A properly executed SQL injection can read sensitive data stored in the database, modify that data, execute administration operations, or potentially issue operating system commands. This enables attackers to manipulate data, create repudiation problems, destroy data or restrict access to it, disclose all data within the database, and make themselves administrators of the database server.

37

Which is more reliable: SSL or HTTPS?

Reference answer

SSL (Secure Sockets Layer) is a secure technology that allows two or more parties to communicate securely over the internet. To provide security, it works on top of HTTP. It works at the Presentation layer. HTTPS (Hypertext Transfer Protocol Secure) is a combination of HTTP and SSL that uses encryption to create a more secure surfing experience. The working of HTTPS involves the top 4 layers of the OSI model, i.e, Application Layer, Presentation Layer, Session Layer, and Transport Layer. SSL is more secure than HTTPS in terms of security.

38

Can you describe a situation where you had to communicate complex security concepts to non-technical stakeholders?

Reference answer

In a recent project, I had to explain the importance of multi-factor authentication to our marketing team. I used simple analogies, like comparing it to a double-lock system, to ensure they understood the concept and its significance in protecting our data.

39

What is network sniffing?

Reference answer

This refers to a scenario where malevolent people intercept data exchanged over the Internet connection. This enables them to capture user credentials for misuse during online transactions or accessing other confidential account details like bank records.

40

What methods do you use when planning a system's security?

Reference answer

Demonstrates candidates' technical and analytical skills, and attention to detail.

41

Can you explain the role of encryption in software security?

Reference answer

Encryption is vital in software security as it protects data by converting it into a code, ensuring that only authorized parties can access it. It is used to secure data both in transit and at rest, making it unreadable without the correct decryption key. Encryption is commonly used to protect sensitive information such as passwords, credit card numbers, and personal data. In addition, it plays a significant role in ensuring secure communications between systems and services. Candidates should demonstrate a solid understanding of when and why to use encryption, emphasizing its importance in maintaining confidentiality and integrity. Look for those who can explain encryption concepts in simple terms, showing their ability to apply these principles effectively.

42

How do you stay current with the latest cybersecurity threats and trends?

Reference answer

I maintain a structured approach to staying current with cybersecurity developments. I start each day reading threat intelligence feeds like CISA alerts and the SANS Internet Storm Center. I'm subscribed to several industry newsletters including Krebs on Security and Dark Reading, and I actively participate in our local OWASP chapter meetings. I also follow key security researchers on Twitter and maintain a Feedly with about 15 cybersecurity blogs. When I learn about new attack vectors, I immediately assess how they might impact our current infrastructure and brief my team during our weekly security standup.

43

What is a public key infrastructure (PKI)?

Reference answer

A PKI is a system that enables the creation, management, and distribution of public-private key pairs for secure communication.

44

How do you handle security incidents in a cloud environment? Can you provide an example?

Reference answer

When handling security incidents, I follow a structured approach: identification, containment, eradication, and recovery. For instance, during a DDoS attack, I quickly identified the source, implemented rate limiting, and worked with the cloud provider to mitigate the threat, ensuring minimal downtime.

45

How do you measure the effectiveness of a cybersecurity program?

Reference answer

Track numbers: Keep an eye on issues at work, speed of addressing them and adherence to rules. Check often: browse over the security setting within and outside the organization Test attacks: Attempt a penetration test. Find and correct vulnerabilities Ask users: Request feedback from users utilizing the security tools.

46

How should I showcase my impact and not just my technical skills?

Reference answer

Use numbers: "Reduced incident response time by 40% through automation", "Deployed zero trust controls across 3 global sites", etc. Quantify, always!

47

How do you balance security requirements with business objectives?

Reference answer

"In my previous role, I implemented a comprehensive security governance framework that aligned with our business objectives. By conducting regular workshops with department heads, I identified their specific security needs while ensuring compliance with ISO 27001. This collaboration led to the development of policies that not only protected sensitive data but also supported the launch of new products. As a result, we achieved both compliance and a 30% reduction in security incidents over the year."

48

What is ARP spoofing?

Reference answer

Who is 0.0.0.0? Tell 0.0.0.1. Linking IP address to MAC, Looks at cache first.

49

What is XSS and how will you mitigate it?

Reference answer

Cross-site scripting is called as XSS. The attacker aims to implement malicious scripts in the web browser of the target by including malicious code in a legitimate web page or web application. To reduce the risk from XSS, companies should sanitize their input. The application code should not output data received as input directly to the browser without checking it for malicious code.

50

What does an information security analyst do?

Reference answer

Some of the important duties of security analyst is listen below: 1. Execute security measures to protect computer systems, data and networks 2. up-to-date on the latest intelligence and hacker techniques 3. Prevent data loss and service interruptions 4. Test data processing system and perform risk assessments 5. Install various security software like firewalls, data encryption and other security measures 6. Recommend security enhancements and purchases 7. Planning, testing and implementing network disaster plans 8. Staff training on information and network security procedures

51

What is a zero-day vulnerability?

Reference answer

They are zero-day vulnerabilities. That means the software has bugs which the company hasn't discovered. So there's no patch available right now. At present there's no fix either. Consequently, hackers have an opportunity to cause harm rapidly.

52

What is a cloud security gateway?

Reference answer

A cloud security gateway is a security solution that monitors and controls traffic between a cloud service and the Internet.

53

Can You Reset a Password-Protected BIOS Configuration?

Reference answer

BIOS (Basic Input or Output System) is a firmware located on a memory chip, often in a computer's motherboard or system board. A typical BIOS security feature is a user password that must be entered to boot up a device. If you wish to reset a password-protected BIOS configuration, you'll need to turn off your device, locate a password reset jumper on the system board, remove the jumper plug from the password jumper-pins, and turn on the device without the jumper plug to clear the password. This will reset the BIOS to default factory settings.

54

How would you handle a security breach involving personal data or sensitive company information?

Reference answer

Handling a security breach involving personal data or sensitive company information is a critical concern for any organization. In the event of a breach, I would follow a predefined incident response plan to ensure an efficient and timely response. This plan should include the following steps: My previous experience as a security engineer was instrumental in designing and implementing an incident response plan that includes clear steps to respond to a security breach. The plan has prevented confidential information from being compromised and minimized any potential damages. Our fast response and monitoring procedures enabled us to identify and eliminate the source of the breach quickly. Additionally, regular testing and training are conducted to ensure that the team can respond adequately to the incident. As a Cyber Security Engineer, I believe the most important aspect of handling a breach is to act as quickly as possible while keeping in mind the legal requirements and minimizing adverse effects. With my experience in incident response, planning, and coordination, I have no doubt that I can handle any challenge regarding an unexpected attack on the company's sensitive data.

55

Can you provide an example of a project where you were responsible for ensuring compliance with industry security standards? – Situation: project requiring compliance with security standards – Task: responsibility for ensuring compliance – Action: steps taken to ensure compliance with the standards – Result: outcome of ensuring compliance with the standards

Reference answer

Situation: A project required PCI DSS compliance for handling credit card data. Task: I was responsible for ensuring compliance. Action: I conducted a gap analysis, implemented encryption for data at rest and in transit, and set up access controls and logging. Result: The project passed the compliance audit without major findings, and we maintained secure processing of payment data.

56

What is SQL injection?

Reference answer

SQL injection is a technique used to exploit user data through web page input by injecting SQL commands as statements. Essentially, these instructions can be used by a malicious user to manipulate her web server for your application. SQL injection is a code injection technique that can corrupt your database. Preventing SQL Injection is given below: - Validation of user input by pre-defining user input length, type, input fields and authentication. - Restrict user access and determine how much data outsiders can access from your database. Basically, you shouldn't give users permission to access everything in your database. - Do not use system administrator accounts.

57

Describe a time you had to convince a team or department to adopt a new security measure.

Reference answer

"In my previous position at a large retail organization, I proposed implementing a new multi-factor authentication system but faced pushback from the IT department due to perceived inconvenience. I gathered data showing that similar organizations had reduced breaches significantly after adopting this measure. By addressing their concerns in a joint meeting and demonstrating potential ROI, I gained their support, and we successfully implemented the system, leading to a 40% decrease in unauthorized access attempts."

58

What is a cloud-based encryption?

Reference answer

Cloud-based encryption is a solution that protects data in transit and at rest in cloud environments using advanced encryption algorithms.

59

What is cross-site scripting (XSS)?

Reference answer

XSS is a type of vulnerability that occurs when an attacker injects malicious code into a website to steal user data or take control of the user's session.

60

What is HTTPS?

Reference answer

HTTPS (Hypertext Transfer Protocol Secure) is a secure communication protocol that combines HTTP with SSL/TLS to provide secure communication between a client and a server.

61

What do you mean by SQL Injection? How do you prevent it?

Reference answer

SQL injection is a typical attack in which fraudsters employ malicious SQL scripts to manipulate backend databases and get access to sensitive data. The hostile actor can see, edit, or remove important company data, customer lists, or customers' personal details contained in the SQL database after the attack is successful. The following practices can help you avoid SQL Injection attacks: - Prepare statements ahead of time. - Use Pre-defined Procedures - Verify the user's input.

62

Explain a Brute Force Attack Along With the Steps To Prevent It.

Reference answer

Brute force attacks strive to unlock password-protected assets by repetitively entering authentication credentials either manually (based on guesswork) or via automated credential stuffing (allowing for rapid testing of numerous possible combinations). To prevent brute force attacks, cyber security professionals should: - Make unique login URLs for various user groups. - Monitor server logs and analyzes log files. - Use two-Factor Authentication. - Limit logins to a particular IP address or range. - Implement CAPTCHA as part of the login process to prevent automated attacks. - Throttle login attempts (triggered by failed login attempts). - Make the root user inaccessible via SSH.

63

Describe a time you identified and resolved a security vulnerability.

Reference answer

"At a previous role with Telefónica, I discovered a SQL injection vulnerability in our web application during a routine security audit. I used a combination of automated scanning tools and manual testing to pinpoint the issue. After documenting my findings, I presented them to the development team, along with a detailed remediation plan that included code changes and additional input validation. As a result, we successfully patched the vulnerability and improved our overall security posture, reducing potential attack vectors by 40%."

64

What Is the Purpose of Penetration Testing in Cybersecurity?

Reference answer

Penetration testing, also known as ethical hacking, is the practice of simulating real-world attacks on systems, networks, or applications to identify vulnerabilities and assess their potential impact. The purpose of penetration testing is to proactively identify security weaknesses, validate the effectiveness of security controls, and provide recommendations for improving the overall security posture. It helps organizations identify and fix vulnerabilities before they can be exploited by malicious actors.

65

How do you test the effectiveness of an incident response plan?

Reference answer

By conducting tabletop exercises, red team-blue team drills, and simulations. Regular testing helps identify gaps, improve coordination, and train staff to respond effectively under pressure.

66

What is a cybersecurity risk assessment?

Reference answer

A cybersecurity risk assessment is an approach to detecting, analyzing, and prioritizing potential threats and vulnerabilities of an organization's information systems, assets, and data and determining appropriate mitigation strategies.

67

How would you create a secret storage system?

Reference answer

I would create a secret storage system using a combination of encryption and access controls. Secrets would be encrypted at rest using a strong algorithm (e.g., AES-256) with a master key stored in a Hardware Security Module (HSM) or a secure key management service (e.g., AWS KMS). Access would be controlled via role-based access control (RBAC) and authentication, with audit logging. The system would provide APIs for secure retrieval and rotation of secrets, and it could be integrated with applications via vault agents (e.g., HashiCorp Vault).

68

Why is cybersecurity compliance important?

Reference answer

Why is it important for companies to follow cybersecurity rules? Because following cybersecurity rules means that a company is observing the law. This aids it in protecting data, avoiding penalties as well as enhancing trust among clients.

69

What is a firewall?

Reference answer

A firewall is a network security system that monitors and controls traffic to protect a company's network from viruses, malware, and other cybersecurity risks. Firewalls are used across organizations of all sizes and by individuals.

70

What is a traceroute? Why is it used?

Reference answer

Traceroute is a network diagnostic command-line tool used to trace the path that data packets take from a source device to a destination over an IP network. It also measures the time (latency) taken at each intermediate hop (router) along the route, helping identify delays or failures in the network path. - Helps identify where packets are delayed or dropped in the network path. - Provides a hop-by-hop map of the route between source and destination. - Assists in network troubleshooting by showing each intermediate router and response time. - Works by sending packets (often ICMP) and recording responses from each hop.

71

What is the difference between IPSEC Phase 1 and Phase 2?

Reference answer

In IPsec, Phase 1 establishes a secure channel (ISAKMP SA) between peers using protocols like IKE, authenticating and negotiating encryption and hashing algorithms. Phase 2, also known as Quick Mode, establishes the IPsec SA for encrypting actual data traffic, negotiating security parameters for the specific data flows and periodically refreshing keys.

72

How do you balance security with business needs?

Reference answer

I ensure that security controls align with business objectives. Instead of creating barriers, I propose risk-based solutions that protect critical assets while maintaining operational efficiency. Clear communication with stakeholders helps in achieving this balance.

73

How would you secure the company's server?

Reference answer

To secure the company's server, I'll first need to ensure that all of the company's passwords – for both root and administrative users – are secure. After that, I'd create new users that I'll use to manage the system and take away remote access from root accounts and the default administrator. After completing this step, I'd create firewall boundaries for remote access.

74

How do you ensure data security during cloud migration?

Reference answer

“In my last role, I led a migration of our customer database to AWS, which required careful attention to both security and compliance. I started by conducting a thorough data classification exercise to identify sensitive information, then implemented encryption both at rest using AWS KMS and in transit with TLS 1.3. We used AWS DataSync for secure transfer and set up VPC endpoints to keep traffic within the AWS network. I also coordinated with our compliance team to ensure we met GDPR requirements by implementing proper access logging and data residency controls. The entire process included regular security assessments and rollback procedures in case of any issues.”

75

Explain the OSI Model.

Reference answer

Developed in the 1970s, the OSI (Open Systems Communications) model is a conceptual framework that illustrates the architecture and communication functions of a network system. The model, which consists of seven collaborative layers, characterizes these functions into rules and describes how layers operate collaboratively to transmit data.

76

How Do You Ensure That a Server Is Secure?

Reference answer

To secure a server, it is vital to first establish a protected connection using SSH (Secure Shell) Protocol, as SSH access encrypts data transmissions. SSH uses port 22 by default, which is common knowledge to hackers—so use port numbers between 1024 and 32,767 to reduce the risk of attack. You should also authenticate an SSH server using SSH keys instead of a traditional password. To secure web administration areas, deploy a Secure Socket Layer (SSL) to safeguard server-client and server-server communications via the internet. Intrusion prevention software, firewalls, password requirements, and user management tactics can help maintain server security.

77

What is adware?

Reference answer

Adware is a type of malware that displays unwanted advertisements on a system.

78

AWS?

Reference answer

Yes, you can write a tool to scan AWS resources (e.g., S3 buckets, EC2 instances, Lambda functions) for secrets. This could involve using AWS Config, CloudTrail, or custom scripts that check for exposed keys in source code, configuration files, or environment variables, and integrate with services like AWS Secrets Manager for remediation.

79

What role does risk management play in IT security engineering?

Reference answer

Risk management ensures that security efforts are prioritized based on business impact. It helps in allocating resources effectively and ensuring the organization is resilient against the most critical threats.

80

What are the challenges in cloud security?

Reference answer

The field of cloud security has been fraught with challenges such as data protection against malicious individuals,hence ensuring only authorized individuals have access to it. Similarly, privacy becomes a major concern with shared cloud infrastructure.

81

What is a penetration test?

Reference answer

A penetration test is a security assessment conducted by Penetration Testers or Ethical Hackers to identify vulnerabilities in systems, networks, or applications through controlled simulated attacks to enhance overall security and mitigate potential risks.

82

Give me an example of a time when you had to explain a complex technical issue to someone without a technical background. How did you ensure the person understood the issue?

Reference answer

A few months ago, I was working on a project to implement a new security solution for our company's network. During the process, we discovered a significant vulnerability in the system. I had to explain the issue and the potential impact to our CEO, who is not technically inclined. I started by framing the problem in terms of potential real-world consequences rather than diving deep into the technical details. I said that it was like having a weak lock on our front door, allowing intruders to enter our house easily. To make sure the CEO understood the level of risk, I explained how this vulnerability could lead to data theft or unauthorized access to sensitive information. I then used analogies and relatable examples to break down the technical aspects. For instance, I compared the process of exploiting the vulnerability to a thief using a master key to open the weak lock. To ensure the CEO was following along, I regularly paused to ask if they had any questions or needed clarification. Finally, I outlined the steps we planned to take to address the vulnerability and secure the system. At the end of our conversation, the CEO thanked me for the clear explanation and expressed a much better understanding of the issue. They felt confident in the measures we were proposing and reassured that we were taking the necessary steps to protect the company's data and network.

83

What are the key phases of an incident response process?

Reference answer

The phases include preparation, detection and analysis, containment, eradication, recovery, and post-incident review. Each step ensures effective handling of threats and reduces future risks.

84

Write a function fib(n) that returns the nth Fibonacci number.

Reference answer

Practice answer.

85

What is the meaning of a secure password, and what are its examples?

Reference answer

To figure out and crack good password you will need plenty of work to put. The password should be unique and strong. A combination of uppercase and lowercase letters, along with numbers and special characters is required for your safety. By the way, 'P@ssw0rd#07' is a safe password.

86

What is Identity and Access Management (IAM) and why is it important in security engineering?

Reference answer

Identity and Access Management (IAM) is a cornerstone of modern cybersecurity involving the policies, processes, and technologies used to manage digital identities and control access to resources. It reduces the risk of unauthorized access and data breaches. At its heart are user authentication (verifying identity through credentials like passwords, biometrics, or tokens) and authorization (determining what resources the authenticated user can access). MFA is a critical control that adds layers of verification. Implementing RBAC or ABAC enforces the principle of least privilege.

87

What are the three primary types of threat intelligence?

Reference answer

The three primary types of threat intelligence are: Strategic Intelligence (high-level information for executives focusing on long-term trends and impacts), Tactical Intelligence (technical details about attacker tools, techniques, and procedures such as malware hashes and IP addresses), and Operational Intelligence (real-time information about specific threats targeting the organization to support active defense).

88

How Do You Differentiate Between Symmetric and Asymmetric Encryption?

Reference answer

While symmetric encryption uses a single key for encryption and decryption, asymmetric encryption uses a public key for encryption and a private key for decryption. The success of symmetric encryption necessitates a secure exchange of the key, and the technique is typically used to transfer large volumes of data. Asymmetric encryption is a slower but more secure technique that is generally deployed to transfer small amounts of data. While symmetric encryption offers confidentiality, asymmetric encryption guarantees confidentiality as well as authenticity and non-repudiation.

89

What is the concept of digital signature?

Reference answer

If you get an email, you probably don't worry about whether it is really from the person it says it's from.

90

Explain how JWT works.

Reference answer

JWT (JSON Web Token) is a compact, URL-safe token format used for securely transmitting information between parties as a JSON object. It consists of three parts: a header (specifying the token type and signing algorithm), a payload (containing claims or data), and a signature (created by encoding the header and payload with a secret or private key). The receiver verifies the signature to ensure the token has not been tampered with.

91

How would you build a culture of security awareness within an organization?

Reference answer

"To build a security culture, I would start by integrating security training into the onboarding process for all new hires, ensuring everyone understands their role in protecting sensitive information. I would implement regular workshops and simulated phishing exercises to engage employees actively. Additionally, I would establish a 'Security Champions' program, empowering individuals in various departments to advocate for security best practices. By measuring engagement through feedback surveys and incident reporting rates, I would continuously refine our approach to fostering a culture of security."

92

What is decryption?

Reference answer

Decryption is the process of converting ciphertext data back into plaintext data.

93

Differentiate between Black Box Testing and White Box Testing.

Reference answer

| Black Box Testing | White Box Testing | |---|---| | It's a type of software testing in which the program's or software's internal structure is concealed. | It is a method of software testing in which the tester is familiar with the software's internal structure or code. | | It is not necessary to have any prior experience with implementation. | It is not necessary to have prior experience with implementation. | | On the basis of the requirement specifications paper, this testing can begin. | This form of software testing begins once the detailed design document has been completed. | | It takes the least amount of time. | It takes the most amount of time. | | It is the software's behavior testing. | It is the software's logic testing. | | It is relevant to higher levels of software testing. | It is relevant to lower levels of software testing. |

94

Explain the CIA Triad in cybersecurity.

Reference answer

The CIA Triad refers to Confidentiality, Integrity, and Availability. Confidentiality ensures data is protected from unauthorized access, integrity ensures data remains accurate and unchanged, and availability ensures resources are accessible when needed.

95

What Do You Mean by a VPN?

Reference answer

A virtual private network (VPN) establishes a protected network connection when using a public network. A VPN can encrypt internet traffic in real-time, thereby securing data that travels across the network and preventing third parties from tracking user activity. VPNs redirect a user's IP address through a remote host server, allowing for IP address concealment.

96

Tell me about a repetitive task at work that you automated away.

Reference answer

An example: I automated the manual process of rotating and distributing SSH keys across hundreds of servers. I wrote a Python script that used Ansible to connect to all servers, rotate the keys, update the authorized_keys file, and verify connectivity. This saved hours of manual work and reduced human error.

97

What are some common security vulnerabilities?

Reference answer

Some common security vulnerabilities include software bugs, weak passwords, misconfigurations, lack of input validation, insecure APIs, inadequate access controls, outdated software, unpatched systems, and insecure network protocols.

98

What are some common compliance and regulatory frameworks security engineers must adhere to?

Reference answer

Common frameworks include: ISO/IEC 27001 (global standard for information security management systems), NIST Cybersecurity Framework (guidelines for identifying, protecting, detecting, responding, and recovering), GDPR (EU data protection regulation), HIPAA (U.S. regulation for health information privacy), and PCI DSS (standard for organizations handling payment card data).

99

What is Spoofing?

Reference answer

Spoofing is a type of cyberattack in which an attacker impersonates a legitimate user, device or system to gain unauthorized access, steal data or bypass security measures. It is commonly used to trick users or systems into trusting fake identities. Types of Spoofing: - IP Spoofing: The attacker manipulates the source IP address in network packets to appear as a trusted system. - ARP Spoofing: The attacker sends fake ARP messages on a local network to associate their MAC address with another device's IP, allowing interception of data. - Email Spoofing: The attacker sends emails that appear to come from legitimate sources to deceive users and steal sensitive information.

100

How does it work in cloud computing?

Reference answer

In cloud computing, firewalls are often virtualized and provided as a service (e.g., AWS Security Groups, Network ACLs, or third-party virtual firewalls). They work similarly to traditional firewalls but are managed through cloud APIs and are integrated with virtual networks, allowing granular control over traffic between instances, subnets, and external networks, often with automation and scalability.

101

Explain the difference between TCP and UDP.

Reference answer

TCP (Transmission Control Protocol) is connection-oriented, providing reliable, ordered, and error-checked delivery of data through mechanisms like acknowledgments, retransmission, and flow control. UDP (User Datagram Protocol) is connectionless, offering faster but unreliable transmission without delivery guarantees, ordering, or retransmission, making it suitable for real-time applications like video streaming or DNS.

102

What is a three-way handshake?

Reference answer

A three-way handshake is a method used in a TCP/IP network to create a connection between a host and a client. It's called a three-way handshake because it is a three-step method in which the client and server exchanges packets. The three steps are as follows: 1xx – Informational responses 2xx – Success 3xx – Redirection 4xx – Client-side error 5xx – Server-side error

103

How would you integrate security into a containerized CI/CD pipeline?

Reference answer

I would integrate security at every stage of the CI/CD pipeline. At the code commit stage, I would run static application security testing (SAST) and secret scanning. During the build stage, I would scan container images for known vulnerabilities (using tools like Trivy, Snyk), enforce image signing, and ensure the base images are from trusted sources. I would also run software composition analysis (SCA) to check for vulnerable dependencies. In the test stage, I would perform dynamic application security testing (DAST) and API security testing. Before deployment, I would run policy-as-code checks (e.g., OPA, Conftest) on Kubernetes manifests and Infrastructure as Code templates to catch misconfigurations. Finally, I would enforce that only signed and scanned images are deployed to production, and implement runtime monitoring to detect threats after deployment.

104

Explain TCP/IP concepts.

Reference answer

TCP/IP is a suite of communication protocols used for connecting devices on the internet. Key concepts include: IP (Internet Protocol) for addressing and routing packets; TCP (Transmission Control Protocol) for reliable, connection-oriented data transmission; UDP (User Datagram Protocol) for connectionless, faster transmission; and application-layer protocols like HTTP, FTP, and DNS. The model has four layers: Application, Transport, Internet, and Network Access.

105

What is the difference between a black box, grey box, and white box test?

Reference answer

A black box test is a penetration test where the tester does not know the system or network, a grey box test is a penetration test where the tester has partial knowledge of the system or network, and a white box test is a penetration test where the tester has full knowledge of the system or network.

106

What is incident response, and how is it managed?

Reference answer

In dealing with cyber-attacks, companies have to respond to incidents, which entail identifying the problem, addressing it and learning from it; this is done by following a clear series of steps as laid down in a laid down plan.

107

What are some common Hashing functions?

Reference answer

The hash function is a function that converts a specific numerical key or alphanumeric key into a small practical integer value. The mapped integer value is used as an index for hash tables. Simply put, a hash function maps any valid number or string to a small integer that can be used as an index into a hash table. The types of Hash functions are given below: - Division Method. - Mid Square Method. - Folding Method. - Multiplication Method.

108

What is the difference between Asymmetric and Symmetric encryption?

Reference answer

Symmetric uses the same key for both encryption and decryption whereas Asymmetric uses different keys for encryption and decryption. Symmetric is usually much faster but the key needs to be transferred over an unencrypted channel.

109

What is the difference between a service account and a user account?

Reference answer

Robot accounts or Service accounts are used for automation. Service accounts should have heavily restricted privileges. Understanding how Service accounts are used by attackers is important for understanding Cloud security.

110

What's your approach to security awareness training for employees?

Reference answer

I believe security awareness training should be engaging, relevant, and continuous rather than a yearly checkbox exercise. I work with HR to implement phishing simulation campaigns using tools like KnowBe4, starting with baseline testing to understand our vulnerability areas. I create role-specific training content—what's relevant for developers differs from what accounting needs to know. I track metrics like click-through rates on simulated phishing emails and improvement over time. At my previous company, I implemented monthly 10-minute security topics during all-hands meetings and created a ‘Security Champion' program where volunteers from each department help reinforce training messages. This approach reduced our phishing click rate from 25% to under 8% over six months.

111

What Do You Mean by Cybersecurity?

Reference answer

Cybersecurity is the protection of critical systems and sensitive information from digital security threats. The field of cybersecurity encompasses infrastructure security, network security, cloud security, and application security. Cybersecurity protocols are responsible for preventing security breaches that could compromise an organization's data and infrastructure. Cybersecurity encompasses security engineering and architecture, incident response, consulting, testing, and ethical hacking.

112

What are the key steps for securing large-scale cloud-based infrastructure?

Reference answer

Securing large-scale cloud infrastructure requires a multi-layered approach involving: implementing strong access controls such as Multi-factor authentication (MFA) and Role-based access control (RBAC); applying encryption to data at rest and in transit with secure key management using hardware security modules (HSMs); designing network architecture to isolate critical workloads through segmentation using virtual private clouds (VPCs), private subnets, and network security groups (NSGs); deploying continuous monitoring with intrusion detection and prevention systems (IDPS) and centralized SIEM platforms; conducting regular vulnerability scanning and penetration testing; and establishing a robust security incident response plan.

113

What do you mean by a botnet?

Reference answer

A botnet is a collection of internet-connected devices, such as servers, PCs, and mobile phones, that are infected with malware and controlled by it. It's used to steal data, send spam, launch distributed denial-of-service (DDoS) attacks, and more, as well as provide the user access to the device and its connection.

114

What do you mean by Perfect Forward Secrecy?

Reference answer

Perfect Forward Secrecy (PFS) is an encryption technique that generates a new, temporary session key for each communication session between a client and a server. This ensures that even if long-term encryption keys are compromised, past communications remain secure. It is widely used in secure applications like websites, messaging and VoIP services to protect user privacy. - Commonly implemented in protocols like TLS using ephemeral key exchange methods (e.g., Diffie–Hellman). - Prevents attackers from decrypting previously recorded data even if they obtain the server's private key later. - Each session is independently encrypted, so a breach in one session does not affect others.

115

A user reports slow network performance. How would you check for ARP spoofing?

Reference answer

To check for ARP spoofing, I would: 1) Examine the ARP table on the affected machine using commands like arp -a and look for multiple IP addresses mapped to the same MAC address or unexpected MAC addresses. 2) Use packet capture tools (e.g., tcpdump, Wireshark) to monitor ARP traffic and look for unsolicited ARP replies or a high volume of ARP packets. 3) Compare the MAC address of the default gateway with the actual MAC address of the router obtained from the network team. 4) Use dedicated ARP spoofing detection tools like Arpwatch or XArp. 5) Check switch logs for port security violations or MAC address flapping. If ARP spoofing is confirmed, I would implement Dynamic ARP Inspection (DAI) on managed switches and use static ARP entries for critical systems.

116

What do you do if a user brings you a pc that is acting 'weird'? You suspect malware.

Reference answer

I would first ask the user about symptoms and recent activity. Then, I would isolate the PC from the network. I would perform a live analysis (check running processes, network connections, autoruns) and then capture a memory dump and disk image. Using forensic tools, I would scan for malware, check logs, and look for persistence mechanisms. If malware is found, I would contain and remove it or reimage the system. I would also report the incident and recommend security awareness training.

117

How do you stay organized and prioritize tasks in a fast-paced environment?

Reference answer

My approach to staying organized and prioritizing tasks in a fast-paced environment begins with establishing a daily routine. I start my day by reviewing my calendar and identifying any urgent tasks that need immediate attention. Then, I create a to-do list that includes both short-term and long-term goals. This helps me stay focused and motivated throughout the day. Using this approach, I was able to successfully manage a complex project that involved multiple stakeholders and strict deadlines. By staying organized and prioritizing tasks, I was able to meet all project milestones on time and within budget.

118

Tell me about a time you discovered a security vulnerability.

Reference answer

"During my internship at a tech startup, I discovered a SQL injection vulnerability in one of our web applications. I conducted a thorough analysis using Burp Suite, documented my findings, and presented them to my supervisor with a proposed fix. After implementing parameterized queries, we successfully mitigated the risk. This experience taught me the importance of vigilance and effective communication in security."

119

How would you prevent public S3 bucket exposure?

Reference answer

To prevent public S3 bucket exposure, I would: 1) Enforce block public access settings at the account and bucket level using AWS S3 Block Public Access. 2) Use bucket policies and IAM policies to restrict access based on least privilege, avoiding wildcard principals. 3) Regularly review bucket permissions using automated tools like AWS Config rules or third-party scanners. 4) Implement Infrastructure as Code (e.g., Terraform) with policy as code (e.g., Sentinel, OPA) to prevent misconfigurations during deployment. 5) Enable AWS CloudTrail and S3 server access logging to monitor access patterns. 6) Use S3 Object Ownership and access control lists (ACLs) appropriately. 7) Set up alerts for any public access changes.

120

What is cloud-based cloud security monitoring?

Reference answer

Cloud-based cloud security monitoring is a solution that provides real-time visibility into cloud security threats and risks

121

What are Polymorphic viruses?

Reference answer

A polymorphic virus is a type of malware that changes its code or appearance each time it infects a new system, making it difficult for antivirus programs to detect using fixed signatures. It uses encryption and a mutation engine to modify its decryption routine while keeping its core malicious behavior the same. When an infected program runs, a decryption routine temporarily decrypts the virus so it can execute and spread to other files. Because its structure keeps changing, detection becomes very difficult. - Uses a mutation engine to generate different decryption code each time. - The virus body remains functionally the same even though its code changes. - Mainly designed to evade signature-based antivirus detection.

122

Do you know what XXE is?

Reference answer

XXE (XML External Entity) is a vulnerability in XML parsers that allows an attacker to inject external entities, potentially leading to disclosure of internal files, denial of service, or server-side request forgery. It occurs when an XML parser processes user-supplied XML input without disabling external entity resolution.

123

How do I authenticate you and know you sent the message?

Reference answer

To authenticate that a message came from you, I would verify a digital signature attached to the message. You would sign the message with your private key, and I would verify the signature using your public key. If the signature is valid, it proves the message was signed by you and has not been altered, assuming your private key is kept secret.

124

What is the CIA triad?

Reference answer

CIA stands for confidentiality, integrity, and availability. The CIA triad is used to secure both systems and operations.

125

Explain what information is added to a packet at each stop of the 7 layer OSI model.

Reference answer

At each layer, headers (and sometimes trailers) are added. Application layer adds application-specific data; Presentation layer adds encoding/encryption metadata; Session layer adds session control information; Transport layer adds TCP/UDP headers (ports, sequence numbers); Network layer adds IP headers (source/destination IP); Data Link layer adds MAC headers and trailers (MAC addresses, CRC); Physical layer converts the frame into bits for transmission.

126

What do you mean by Shoulder Surfing?

Reference answer

A shoulder surfing attack describes a situation in which an attacker can physically look at a device's screen or keyboard and enter passwords to obtain personal information. Used to access malware. Similar things can happen from nosy people, leading to an invasion of privacy.

127

What is the main difference between encryption and hashing?

Reference answer

Encryption is reversible whereas hashing is irreversible. Hashing can be cracked using rainbow tables and collision attacks but is not reversible. Encryption ensures confidentiality whereas hashing ensures Integrity.

128

What is a data leak? How can you detect it and prevent it?

Reference answer

A data leak is when a company's or organization's private data is released to the public in an unauthorized manner. Data leaks can come in many ways such as hacked emails and networks, stolen or lost laptops, or released photos. To prevent a data leak, a company needs to restrict internet uploads, add restrictions to email servers, and restrict the printing of confidential information and data. To detect a data leak, you'll need to: 1) Monitor access to all your networks 2) Evaluate the risk of third-parties 3) Identify and secure sensitive data 4) Encrypt data 5) Secure all endpoints 6) Evaluate permissions across the organization 7) Use cybersecurity risk assessments

129

What is a honeypot in cybersecurity?

Reference answer

A honeypot is like a fake system or network set up by people to deceive someone hacking. It observes, tracks and studies assaults to ensure improved security.

130

Describe the hardening measures you've put on your home network.

Reference answer

On my home network, I have: changed default router admin credentials, enabled WPA3 encryption on Wi-Fi, disabled WPS, set up a guest network for IoT devices, enabled firewall and NAT, used a VPN for remote access, updated firmware regularly, configured DNS filtering (e.g., Pi-hole), and disabled remote management.

131

In your opinion, what qualities are necessary to be an effective team player in a security engineering team?

Reference answer

Key qualities include strong communication skills to share findings clearly, collaboration to work with diverse teams, adaptability to handle evolving threats, and a proactive attitude to identify and address issues before they escalate. Additionally, being open to feedback and continuously learning from peers is essential for team success.

132

How would you approach reducing security vulnerability resolution times across software products?

Reference answer

Watch our answer here.

133

What are the three primary goals of security?

Reference answer

The three primary goals of security are confidentiality, integrity, and availability (CIA).

134

What is the difference between authentication and authorization?

Reference answer

Authentication verifies the identity of a user, while authorization determines what resources or actions that user is allowed to access.

135

HIDS vs NIDS: Are They the Same?

Reference answer

HIDS are host-based intrusion detection systems while NIDS are network-based intrusion detection systems. Because HIDS can detect malicious data packets originating from within the enterprise network, these systems are useful for catching inside threats. HIDS reviews historical data to identify unconventional cyberattacks—unusual host-based actions changes to system files will trigger an alert. NIDS, however, detect threats in real-time through live data tracking of network traffic, meaning NIDS can catch hackers before a complete system breach occurs.

136

What is the concept of micro-segmentation?

Reference answer

A network is divided into minute fractions at the very small scale while this makes it difficult for hackers to manoeuvre throughthe network in case they infiltrate a small part.

137

What is a security incident response plan?

Reference answer

A security incident response plan is a set of procedures that outline how an organization will respond to a security incident, such as a data breach or ransomware attack.

138

Tell me about a time when you had to work with a team to implement a security protocol. How did you communicate your thoughts and ideas with the team?

Reference answer

At my previous job, we were tasked with implementing a new multi-factor authentication protocol across the entire organization. As the lead Cyber Security Engineer, I was responsible for ensuring that the team executed the task seamlessly. To start, I initiated a kick-off meeting with my team to discuss the project's objectives and the reasons behind the implementation of this new protocol. I made it a point to explain the technical aspects in a non-technical way so that everyone on the team understood the importance of the project, whether they were a developer or an IT support staff member. During the implementation process, I organized regular check-ins and progress updates to ensure that everyone was on track and aware of any changes or challenges that we faced. I encouraged an open communication environment where team members could share their thoughts and concerns, allowing us to address any issues that arose effectively. We also conducted a dry run before rolling out the new security protocol to the entire organization. This allowed the team members to walk through the implementation process step-by-step and discuss any potential roadblocks or clarifications needed. Through these open lines of communication and a focus on collaboration, we were able to successfully implement the security protocol within the given timeframe. This experience reinforced my belief in the importance of effective communication and teamwork when working on complex technical projects like implementing a security protocol.

139

How does a blockchain ensure data integrity and security?

Reference answer

Blockchain technology is an innovative approach to ensuring data integrity and security. From what I've seen, there are a few key features that contribute to its robustness: First, the distributed nature of a blockchain means that data is stored across multiple nodes in a network, making it difficult for an attacker to compromise the entire system. In a sense, it's like having multiple copies of the same data, so even if one node is compromised, the others can still maintain the integrity of the information. Second, the use of cryptographic hashing ensures that each block in the chain is securely linked to the previous block. This makes it virtually impossible to alter the information in a block without changing the entire chain, which would require a tremendous amount of computational power. Third, the consensus mechanism used in blockchain systems requires that a majority of nodes in the network agree on the validity of a new block before it can be added to the chain. This helps prevent unauthorized changes to the data, as it would require the attacker to control a majority of nodes. Lastly, the immutability of the blockchain means that once data is added to the chain, it cannot be altered or deleted. This provides a permanent and tamper-proof record of transactions, which is particularly useful in applications like financial systems or supply chain management.

140

What is cloud-based cloud compliance management?

Reference answer

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

141

What is the OSI Model and what are its layers?

Reference answer

Application; layer 7 (and basically layers 5 & 6) (includes API, HTTP, etc). Transport; layer 4 (TCP/UDP). Network; layer 3 (Routing). Datalink; layer 2 (Error checking and frame synchronisation). Physical; layer 1 (Bits over fibre).

142

What is Cybersecurity, and why is it important?

Reference answer

The critical importance of cybersecurity is mainly to protect computer systems, networks, and programs from cyber-attacks whose aim is access, alter, or destroy sensitive user data. In this case, it also helps in ensuring confidentiality of information, as well as preventing privacy breaches or financial losses.

143

What is a VPN?

Reference answer

A VPN is a virtual private network. It can be applied to both small-scale networks and to large informational data systems.

144

How do you perform digital forensics after an incident?

Reference answer

I collect and preserve evidence by imaging drives, capturing memory, and securing logs. Tools like EnCase, FTK, or Autopsy help in forensic analysis. Chain of custody is maintained to ensure admissibility in legal investigations.

145

What is the NIST Cybersecurity Framework?

Reference answer

The NIST Cybersecurity Framework is a voluntary framework that provides guidelines and best practices for managing and reducing cybersecurity risk.

146

What is DevSecOps?

Reference answer

DevSecOps integrates security into DevOps pipelines, ensuring security is automated and continuous. It enables faster development without sacrificing protection by embedding security early in the software development lifecycle through automated scanning, secure coding, and CI/CD pipelines.

147

What Is SSL Encryption?

Reference answer

SSL (Secure Sockets Layer) encryption serves to create a secure internet connection. SSL encryption protects client-client, server-server, and client-server connections, circumventing unauthorized parties from monitoring or tampering with data transmitted online. An updated protocol called TLS (Transport Layer Security) encryption has replaced SSL encryption as the standard security certificate.

148

What is a Firewall?

Reference answer

A firewall is a hardware or software-based network security device that monitors all incoming and outgoing traffic and accepts, denies or drops that particular traffic based on a defined set of security rules.

149

What does Zero Trust mean?

Reference answer

Zero Trust is a security model based on the principle of 'never trust, always verify.' It assumes that threats can exist both inside and outside the network, so every access request must be authenticated, authorized, and encrypted regardless of the source. Key components include micro-segmentation, least privilege access, continuous monitoring, and multi-factor authentication.

150

Describe the CIA Triad.

Reference answer

The CIA Triad stands as a cornerstone in information security that represents three core principles of information security: Confidentiality, Integrity, and Availability. These principles help organizations ensure the protection and reliability of their data and systems.

151

What is an Active Reconnaissance?

Reference answer

Active reconnaissance is a kind of computer attack where intruder engages the target system for collecting the data about vulnerabilities. The attackers mostly use port scanning to identify vulnerable ports and then exploit the vulnerabilities of services that are associated with open ports.

152

How do cookies work?

Reference answer

Cookies are small pieces of data stored on the client's browser by a web server. When a user visits a website, the server can send a cookie to the browser, which stores it. On subsequent requests to the same server, the browser sends the cookie back, allowing the server to recognize the user, maintain session state, or track preferences.

153

What is a cloud-based vulnerability management system?

Reference answer

A cloud-based vulnerability management system is a solution that identifies, classifies, and prioritizes vulnerabilities in cloud-based systems and applications.

154

How do you align security practices with compliance frameworks?

Reference answer

I map controls from frameworks like ISO 27001, NIST CSF, PCI DSS, or HIPAA to organizational policies. Regular audits and compliance dashboards help track adherence and identify areas for improvement.

155

Given a sample packet capture - Identify the protocol, the traffic, and the likelihood of malicious intent.

Reference answer

I would analyze the packet capture by examining key indicators: source/destination IPs, ports, protocol headers (e.g., TCP flags, payload size), and payload content. For example, if I see a high volume of SYN packets to many ports (SYN flood), that indicates malicious intent (DDoS). If it's normal HTTP traffic, likelihood is low. I would also look for unusual patterns, like base64-encoded payloads or connections to known malicious IPs.

156

How does a firewall improve network security?

Reference answer

A firewall performs security functions by blocking outsiders from gaining unauthorized entry, separating undesirable data packets, and examining activities in the network to identify and prevent harmful operations.

157

What is the TCP three way handshake?

Reference answer

The TCP three-way handshake is the process to establish a TCP connection. It involves: (1) The client sends a SYN packet to the server, (2) The server responds with a SYN-ACK packet, and (3) The client sends an ACK packet back. This synchronizes sequence numbers and establishes a reliable connection.

158

What is a proxy firewall?

Reference answer

A proxy firewall is a type of firewall that operates at the application layer and monitors traffic by acting as an intermediary between clients and servers. It uses a proxy server to process requests on behalf of users, preventing direct communication with the destination system. This helps in filtering and securing application-level data such as HTTP, FTP and SMTP traffic. - It hides internal network details by masking client identities. - It can inspect and filter content more deeply than traditional firewalls. - It improves security but may introduce slight delays due to extra processing.

159

How would you design a security architecture for a new web application handling sensitive customer data?

Reference answer

I'd start by conducting a threat modeling exercise using STRIDE methodology to identify potential attacks against the application and data. For the architecture, I'd implement a multi-tier design with the web application in a DMZ behind a web application firewall, separating it from the database tier with internal firewalls. I'd require strong authentication including multi-factor authentication for administrative access and implement OAuth 2.0 with JWT tokens for user sessions. All sensitive data would be encrypted using AES-256 at rest and TLS 1.3 in transit, with proper key management through a hardware security module or cloud KMS. I'd integrate SAST and DAST tools into the development pipeline and implement comprehensive logging that feeds into a SIEM for real-time monitoring. Finally, I'd establish an incident response plan specific to potential data breaches with clear communication procedures.

160

What are the key principles of a secure password storage system?

Reference answer

In my experience, there are several key principles to consider when designing a secure password storage system. First, it's essential to use strong, unique passwords, which means they should be long, include a mix of characters, and not be easily guessable. I like to think of it as creating a passphrase with multiple words, numbers, and special characters. Second, it's crucial to store passwords securely. This means that passwords should be hashed and salted, making it difficult for attackers to reverse-engineer the original password. In my last role, I implemented a password storage system that used bcrypt, a popular password hashing algorithm. Third, implementing multi-factor authentication (MFA) can add an extra layer of security. By requiring users to provide additional proof of identity, such as a fingerprint or a one-time code from a mobile device, you can reduce the risk of unauthorized access. Lastly, password storage systems should include monitoring and alerting mechanisms to detect and respond to potential security threats. In my last role, I helped develop a system that would notify administrators of any suspicious login attempts, allowing them to take appropriate action.

161

How do you educate and train teams on cloud security best practices?

Reference answer

I conduct regular training sessions and workshops, using real-world scenarios and hands-on exercises to ensure practical understanding. Additionally, I provide up-to-date resources and continuous learning opportunities to keep the team informed about the latest cloud security best practices.

162

How can Github webhooks be used in a malicious way?

Reference answer

GitHub webhooks can be misused if an attacker gains access to repository settings, allowing them to redirect webhook payloads to a malicious server, exfiltrating secrets or triggering unauthorized actions. Attackers can also use webhooks to perform remote code execution by sending crafted payloads that trigger automated processes, or to cause denial of service by overwhelming the target endpoint with repeated requests.

163

Can you explain the different types of authentication protocols used in system security, and how they differ?

Reference answer

Common authentication protocols include Password-Based Authentication (simple but weak), Multi-Factor Authentication (MFA) which adds layers like tokens or biometrics, Kerberos (ticket-based and secure for networks), and OAuth/OpenID Connect (used for delegated access and single sign-on). They differ in security levels, complexity, and use cases. For example, Kerberos is more secure for enterprise networks, while OAuth is better for web applications.

164

How do you handle third-party vendor risks?

Reference answer

By conducting vendor risk assessments, ensuring security clauses in contracts, and requiring compliance certifications like SOC 2 or ISO 27001. Continuous monitoring and periodic audits ensure vendors remain secure.

165

Provide an example of a time when you had to implement a security protocol for a system that was not previously secure. – Situation: system with no previous security protocol – Task: responsibility to implement a security protocol – Action: steps taken to implement the security protocol – Result: outcome of implementing the security protocol

Reference answer

Situation: A legacy application had no authentication or encryption. Task: I was responsible for implementing a security protocol. Action: I deployed TLS for encryption, integrated OAuth 2.0 for authentication, and added session management controls. Result: The application became compliant with security standards, and we eliminated risks of data interception and unauthorized access.

166

What is a Security Operations Center (SOC)?

Reference answer

A Security Operations Center, which consists of a group of individuals, is responsible for monitoring any security issues that may occur, as well as responding accordingly.

167

If you're going to compress and encrypt a file, which do you do first and why?

Reference answer

You should compress first and then encrypt. Compressing before encryption reduces the size of the data, making encryption more efficient. Additionally, encryption produces random-looking output that is not compressible, so encrypting first would make compression ineffective or even increase the size.

168

How would you explain the importance of software security to non-technical stakeholders?

Reference answer

Explaining the importance of software security to non-technical stakeholders involves using relatable metaphors and avoiding jargon. One might compare software security to locking the doors and windows of a house to protect against intruders. It's crucial to convey that software security is about safeguarding sensitive information and ensuring trust in digital products. Highlighting recent case studies of security breaches and their impacts can also be effective. Seek candidates who can communicate complex ideas clearly and persuasively, demonstrating their ability to bridge the gap between technical and non-technical audiences. A good communicator will ensure all stakeholders understand the value and necessity of robust security measures.

169

Differentiate between hashing and encryption.

Reference answer

| Hashing | Encryption | |---|---| | It is a method of converting data to a smaller fixed value known as the key, which is then used to represent the original data. | It's the technique of securely encoding data such that only the authorized user with the key or password can get the original data; for everyone else, it seems to be rubbish. | | By whatever method, the hash code or key cannot be reverted to the original information. It can only be mapped, and the hash code is compared; if the hash code is the same, the information is identical; otherwise, it is not. It is not possible to get the original data. | If we know the encryption key and technique used for encryption, we can easily extract the original data. | | In comparison to encryption, it is more secure. | In comparison to hashing, it is less secure. | | The goal of hashing is to index and retrieve data from a database. The procedure is really quick. | Encryption transforms data in order to keep it hidden from others. | | The hashed data is usually short and constant in length. It does not increase in size as the length of information increases. | The length of the encrypted data is not defined. It expands as the amount of data grows longer. | | Eg:- SHA256 algorithm | Eg:- RSA, AES algorithm |

170

What is a Security Misconfiguration?

Reference answer

Security misconfiguration is a vulnerability when a device//network is configured in a way which can be exploited by an attacker to take advantage of it. These exposures occur due to apprehensive default configuration, poorly documented configuration and side effects of optional configuration.

171

What is the DREAD risk assessment model and what are its criticisms?

Reference answer

Damage potential Reproducibility Exploitability Affected Users Discoverability DREAD obsolete? Measures are subjective, takes too much effort

172

How would you prevent a MITM attack?

Reference answer

To prevent a MITM attack, I'd log onto the company's VPN and use a strong WPA or WEP encryption. After that, I'd use an IDS to review potential risk factors. Then, I'd set up the PKI infrastructure for public key pair-based authentication.

173

What is a cloud-based cloud security posture management (CSPM)?

Reference answer

Cloud-based CSPM is a solution that provides visibility and control over cloud security posture to identify and remediate security risks.

174

How would you design a security awareness training program for employees?

Reference answer

"I believe a strong security awareness program is essential in any organization. I would begin by conducting a survey to evaluate employees' existing knowledge and identify common misconceptions. The training would cover topics like phishing, password management, and safe browsing practices, delivered through engaging workshops and interactive e-learning modules. I would implement quizzes and phishing simulations to measure effectiveness and keep the content regularly updated based on emerging threats. By fostering a culture of security awareness, we can significantly reduce the risk of human error leading to breaches."

175

What is the difference between plaintext and cleartext?

Reference answer

Plaintext: Plaintext is the original readable data that is intended to be encrypted into ciphertext using an encryption algorithm. It serves as the input for encryption processes in cryptography. - It is converted into ciphertext for security purposes. - It is used in encryption and decryption processes. - It may not always be directly exposed to users. Cleartext: Cleartext is readable data that is stored or transmitted without any encryption and is not intended to be encrypted. It is directly accessible and understandable without any transformation. - It does not require decryption to be read. - It is vulnerable to unauthorized access. - It is commonly found in unsecured communications.

176

What is a cloud-based incident response playbook?

Reference answer

A cloud-based incident response playbook is a pre-defined set of procedures and guidelines for responding to security incidents in cloud environments.

177

What are the various sniffing tools?

Reference answer

Sniffing tools are used to capture and analyze network traffic for monitoring, troubleshooting and security analysis. Some common network sniffing tools include: - Auvik - SolarWinds Network Packet Sniffer - Wireshark - Paessler PRTG - ManageEngine NetFlow Analyzer - Tcpdump - WinDump - NetworkMiner

178

What Is multi-factor authentication, and how does it enhance security?

Reference answer

You have to present yourself as who you are by at least two different methods before accessing your account using multifactor authentication which boosts security by increasing the difficulty level for hackers who might have accessed only your password.

179

What tools are used for security assessment?

Reference answer

There are several tools used for security assessment. Some common tools include:

180

How do you prepare for an external security audit?

Reference answer

By reviewing existing documentation, conducting internal assessments, patching vulnerabilities, and ensuring security processes are well-documented. I also coordinate with stakeholders to ensure evidence is ready for auditors.

181

Explain a Three-Way Handshake.

Reference answer

TCP/IP networks create client-server connections using three-way handshakes, which allow both ends of the connection to reliably transmit data between devices. When a client wants to connect with a server, an SYN (synchronize sequence number) is sent to inform the server of the client's impending request. The server responds with SYN+ACK (acknowledgment), to which the client responds with ACK, thereby establishing a connection through which data will transfer.

182

What is phishing? And how can you prevent it?

Reference answer

Phishing is a type of cyberattack where a hacker pretends to be a trustworthy person or company in order to steal personal and sensitive data and information using a fraudulent email or another type of message. To prevent phishing attacks, a user or company can follow these best practices: - Avoid entering sensitive information – such as credit card data or passwords – in websites you don't know or trust - Use firewalls so they can detect unsafe and spammy sites - Use antivirus software with internet security - Verify the site's security - Use an anti-phishing toolbar

183

IDS vs IPS: What Is the Difference?

Reference answer

Intrusion detection systems (IDS) monitor networks for suspicious activity. When a potential threat is detected, the system will alert the administrator. Intrusion Prevention Systems (IPS) are equipped to respond to threats, and are able to reject data packets, issue firewall commands, and sever connections. Both systems can operate on a signature or anomaly basis. Signature-based systems detect attack behaviors or "signatures" that match a preprogrammed list, while anomaly-based systems use AI and machine learning to detect deviations from a model of normal behavior.

184

Define DNS

Reference answer

The Domain Name System (DNS) is a network service that translates human-readable domain names (like website names) into IP addresses used by computers to identify each other on the internet. This allows users to access websites easily without remembering numerical IP addresses. - Acts like a directory or phonebook of the internet - Enables browsers to locate and load web pages - Works in the background whenever a website is accessed

185

What Do You Mean by XSS?

Reference answer

Cross-site scripting (XSS) is a type of cyberattack that injects malicious scripts into legitimate websites. XSS attacks use web applications to send these fragments of code—typically as browser-side scripts—to oblivious end users whose browsers execute the malicious script because it appears to originate from a trusted source.

186

What do you mean by penetration testing?

Reference answer

Penetration testing is done to find vulnerabilities, malicious content, flaws and risks. It's done to make the organization's security system defend the IT infrastructure. It is an official procedure that can be deemed helpful and not a harmful attempt. It is part of an ethical hacking process that specifically focuses only on penetrating the information system.

187

How would you detect a DDOS attack?

Reference answer

I would detect a DDoS attack by monitoring network traffic for anomalies, such as a sudden surge in traffic from many source IPs, high bandwidth usage, or unusual patterns in packet types (e.g., SYN floods, UDP floods). Using tools like netflow analysis, SIEM alerts, and threshold-based triggers, I would identify the attack and then mitigate by filtering traffic, using rate limiting, or employing DDoS protection services (e.g., Cloudflare, AWS Shield).

188

What are the elements of cyber security?

Reference answer

Cyber security consists of several key elements that work together to protect systems, networks and data from cyber threats. - Application Security: Protects software applications by identifying and fixing vulnerabilities during development to prevent attacks. - Information Security: Ensures that data is protected from unauthorized access, modification or deletion. - Network Security: Safeguards computer networks from unauthorized access, misuse and cyber threats. - Disaster Recovery & Business Continuity: Focuses on restoring systems and operations quickly after a cyber incident or disaster. - Operational Security (OPSEC): Protects sensitive information by controlling how data is accessed, handled and shared within an organization. - End-User Education: Trains users to recognize and avoid cyber threats, reducing risks caused by human error.

189

How do you conduct a security architecture review?

Reference answer

I evaluate current network design, authentication methods, encryption practices, and security policies. I compare them against industry standards such as NIST, CIS benchmarks, and ISO 27001 to identify gaps and recommend improvements.

190

What is incident response?

Reference answer

Incident response is a systematic approach to identifying, containing, and mitigating the impact of a security incident.

191

What are the challenges in securing big data?

Reference answer

The following are problematic areas related to securing big data: i) Volume: Managing and safeguarding huge volumes of information is a cumbersome task. ii) Variety: Several methods are required to guarantee the safety of different kinds of data. iii) Velocity: There is a need for real-time security solutions for data moving at very high speeds. iv) Complexity: It might be difficult to apply security controls for large data environments.

192

How does threat modeling work?

Reference answer

Threat modeling is a structured process to identify, assess, and mitigate security threats to a system. It typically involves: defining the system and its assets, identifying potential threats (e.g., using frameworks like STRIDE), analyzing vulnerabilities, determining risk levels, and implementing countermeasures. The goal is to proactively address security issues before they are exploited.

193

How do you stay updated with the latest security threats and vulnerabilities?

Reference answer

Staying updated with the latest security threats and vulnerabilities is crucial for any security engineer. Candidates might mention subscribing to security newsletters, following industry blogs, and participating in online forums and communities. Attending security conferences and workshops can also be a valuable way to learn about new threats and network with other professionals. Engaging with platforms like Twitter for real-time updates from security experts can also be helpful. An ideal candidate will demonstrate a proactive approach to learning and staying informed, showing an eagerness to adapt to the ever-evolving nature of software security.

194

Describe a time when you had to make a difficult decision related to security measures. What was the decision and how did you come to that conclusion?

Reference answer

One time, while I was working as a security engineer at a startup, we discovered a potential vulnerability in our authentication system. The decision I had to make was whether to implement a temporary solution right away to minimize the potential risk, or wait to fully redesign the system with a long-term fix. In order to come to a conclusion, I had to weigh the pros and cons of each option. I knew that implementing a temporary solution would require less time and resources initially, but it would not fully address the underlying issue. On the other hand, waiting to redesign the system entirely would take longer and require more coordination with the development team, but it would provide a more secure solution in the long run. After careful consideration, I decided to proceed with the temporary solution, as the potential risk of a security breach was too high to ignore. I felt that it was crucial to prioritize the safety of our users and prevent any possible damage to the company's reputation. We implemented the temporary fix immediately, and I communicated this decision to the development team, who then started working on a long-term redesign of the authentication system. Through this experience, I learned the importance of balancing short-term risk mitigation with long-term security improvements, and I gained valuable insights into prioritizing security measures when faced with difficult decisions.

195

How can you strengthen user authentication in the company?

Reference answer

To enhance user authentication, I'd use two-factor authentication or, depending on the company's needs, a non-repudiation approach. After that, I'd use these two methods with the network for failsafe authentication.

196

What is the difference between IDS and SIEM?

Reference answer

IDS: Intrusion Detection System (signature based (eg. snort) or behaviour based). SIEM: Security Information and Event Management.

197

What is MAC spoofing?

Reference answer

The MAC address is virtually etched to the hardware by the device manufacturer, which means users cannot change or rewrite the MAC address. However, it's possible to mask the address on the software side. This masking is called MAC spoofing. Hackers use MAC spoofing to hide their identity and imitate others. In network terminology, spoofing is manipulating or infiltrating the address system in computer networks. Other targets that hackers can spoof or manipulate are internet protocol (IP), address resolution protocol (ARP), and the domain name system (DNS).

198

What is data leakage and Explain the factors causing data leakage?

Reference answer

The separation or departing of IP from its intended place of storage is known as data leakage. The factors that are responsible for data leakage can be 1. Copy of the IP to a less secure system or their personal computer 2. Human error 3. Technology mishaps 4. System misconfiguration 5. A system breach from a hacker 6. A home-grown application developed to interface to the public 7. Inadequate security control for shared documents or drives 8. Corrupt hard-drive 9. Back up are stored in an insecure place

199

What is your approach to implementing a zero-trust security model?

Reference answer

I approach zero-trust implementation in phases, starting with identity and access management. First, I audit all user accounts and implement multi-factor authentication across all systems. Then I work on network segmentation, creating micro-perimeters around critical assets and implementing least-privilege access policies. I use tools like identity governance platforms to continuously verify user permissions and monitor for unusual access patterns. At my previous company, I led the zero-trust pilot by starting with our finance team's access to our ERP system. We reduced their network access to only what was necessary for their roles and implemented continuous monitoring. This pilot caught two instances of credential compromise that traditional perimeter security would have missed.

200

What does XSS stand for? How can it be prevented?

Reference answer

XSS stands for Cross-Site Scripting. It is a web application vulnerability where attackers inject malicious scripts into trusted websites, which then execute in the user's browser. This can lead to data theft, session hijacking, account compromise or malware infection. Prevention of XSS: - Validate and filter all user inputs to ensure only expected data is accepted. - Encode output data so that user input is not executed as code in the browser. - Use proper HTTP headers like Content-Type and X-Content-Type-Options to control how content is interpreted. - Implement a Content Security Policy (CSP) to restrict execution of unauthorized scripts. - Avoid directly inserting untrusted data into HTML, JavaScript or URLs without sanitization.

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