Ethical Hacker Common Interview Questions Answered

1

How does SevenMentor Institute support ethical hacking interview readiness

Reference answer

SevenMentor Institute focuses on practical labs scenario based learning and Cyber Security training so students explain answers from experience not memorized notes.

2

How can the effectiveness of ethical hacking activities be measured?

Reference answer

The effectiveness of ethical hacking activities can be measured by assessing the number of vulnerabilities identified and exploited, the level of access gained, and the overall impact on the target system or network. It is also important to evaluate the effectiveness of any security measures implemented as a result of the engagement.

3

How can you avoid ARP poisoning?

Reference answer

There are several approaches to preventing ARP Poisoning attacks: - Using Static ARP Tables - Using Switch Security - Using Physical Security - By Network Isolation - Using Encryption

4

What is CSRF, what does it entail and how can it be prevented?

Reference answer

Cross-site request forgery (CSRF) is a web security vulnerability that allows an attacker to induce users to perform actions that they do not intend to perform by using maliciously crafted web requests. It can allow an attacker to cause a victim user to carry out an unintended action, for example changing their email address, password or transferring funds. This can result in a full compromise of the victim's account. CSRF attacks can be prevented through the use of CSRF tokens, which ensures the request made by the end user is genuine and makes it impossible for attackers to craft a malicious HTTP request for the end user to execute. To be effective, CSRF tokens need to be unpredictable, tied to the user's session and validated upon every user action is executed.

5

What can an ethical hacker do?

Reference answer

An ethical hacker is a computer system and networking master who systematically endeavours to infiltrate a PC framework or network for the benefit of its owners to find security vulnerabilities that a malicious hacker could potentially exploit.

6

What is a "script kiddie"?

Reference answer

A script kiddie is someone with limited technical skills who uses pre-written scripts or tools to carry out attacks without fully understanding the underlying principles.

7

What is ‘defense in depth' in penetration testing?

Reference answer

‘Defense in depth' in penetration testing refers to a layered security approach designed to protect systems and data by implementing multiple defensive mechanisms at various levels. This strategy ensures that if one layer is compromised, others remain in place to detect or deter an attack. It includes measures such as firewalls, intrusion detection systems, encryption, and access controls to create a robust and resilient security posture.

8

What is Metasploit, and how does it work?

Reference answer

Metasploit is an exploitation framework that helps penetration testers identify and exploit vulnerabilities in systems. It works by providing a large repository of exploits that can be used to compromise systems.

9

What makes an ethical hacker valuable to a company

Reference answer

Value comes from reducing risk not showing skill. The best testers help organizations become safer without disruption.

10

How do you handle ransomware attacks?

Reference answer

- Isolate infected systems immediately - Identify and remove the malware - Restore data from backups - Report the attack to cybersecurity authorities

11

What are some common penetration testing methodologies?

Reference answer

Penetration testing methodologies provide a structured approach to conducting tests, including: - OSSTMM (Open Source Security Testing Methodology Manual): Comprehensive methodology covering a wide range of testing techniques. - NIST (National Institute of Standards and Technology): Provides guidelines and standards for penetration testing. - PTES (Penetration Testing Execution Standard): Offers a detailed framework for planning, executing, and reporting penetration tests.

12

What is Ethical Hacking?

Reference answer

Ethical hacking involves utilizing expertise in computer and networking technologies to assess and enhance the security of an organization's systems and networks. These Ethical hacking professionals, often referred to as white hat hackers, utilize their skills to detect vulnerabilities in computer systems and networks and take steps to remediate them in order to prevent malicious attacks. Ethical hacking professionals operate with the explicit permission of the system or network owner and strive to improve the overall security posture of the organization. Ethical hacking serves as a valuable tool for organizations to safeguard their systems and data from cyber threats and maintain the confidentiality, integrity, and availability of their information.

13

What is cross-site scripting (XSS)?

Reference answer

XSS is a vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users.

14

What is "AI security"?

Reference answer

AI security focuses on protecting artificial intelligence (AI) systems from attacks and ensuring their safe and reliable operation. It involves safeguarding AI models from manipulation, preventing data poisoning, and addressing potential biases or ethical concerns.

15

Explain Cross-Site Scripting (XSS)

Reference answer

XSS allows attackers to inject malicious scripts into web pages viewed by users. Types: Stored XSS (payload stored in database), Reflected XSS (payload reflected via request), DOM-based XSS (client-side JavaScript manipulation).

16

What is a "botnet"?

Reference answer

A botnet is a network of compromised computers or devices controlled by an attacker. These infected machines, known as bots, can be used to carry out various attacks, such as denial-of-service attacks, spam distribution, or data theft.

17

What are the ethical hacking tools?

Reference answer

The market consists of many ethical hacking tools developed for different purposes. The major types of tools include the following: - NMAP Network plotter: Associate degree used for network discovery and security auditing, open-source tool. - Metasploit: This happens to be one of the strongest tools to exploit for conducting basic penetration testing. - Burp Suite: Burp Suite is a general platform widely employed for performing security testing of web applications. - Angry IP Scanner: Angry info processing scanner is a lightweight, cross-platform information processing address and port scanner. - Cain & Abel: It is a password recovery tool for Microsoft operational Systems. - Ettercap: Ettercap stands for local area network Capture. It is used in the network by any network security tool for the Man-in-the-Middle attack.

18

what is HMAC (Hashed Message Authentication Code)?

Reference answer

HMAC is an encryption algorithm for enforcing message authenticity. If HMAC is used with SSL or TLS to provide messages. It is also a cryptographic hash function that calculates a message digest on data. The export (or generation) of outputs is the unique representation of the data functions. HMAC is worth mentioning because it can provide security when transmitting data over a network.

19

List out some of the common tools used by Ethical hacking professionals (Ethical hackers).

Reference answer

Some of the best tools for Ethical hacking professionals to use include: - Meta Sploit - Wire Shark - NMAP - John The Ripper - Maltego

20

What is ARP Spoofing(ARP poisoning) in Ethical Hacking?

Reference answer

ARP spoofing, also known as ARP cache poisoning, is a type of cyber attack in which an attacker alters the ARP cache on a network by sending forged ARP requests and reply packets. This can allow the attacker to redirect network traffic to a different device and intercept sensitive information. In addition to altering the ARP cache, the attacker may also change the MAC (media access control) address of a device in order to launch the attack. ARP spoofing is a serious threat, as it can allow attackers to gain access to sensitive information and launch other types of attacks on a network. It is important to implement security measures to protect against ARP spoofing and to be vigilant in detecting and responding to these types of threats.

21

What is encryption and why is it important?

Reference answer

Encryption converts data into a coded form to prevent unauthorized access, ensuring confidentiality and integrity.

22

Elaborate on the role of artificial intelligence in cyber security.

Reference answer

The role of artificial intelligence in cybersecurity allows the cybersecurity professional to automatically analyze the amount of data used for anomalies and improve the effectiveness of security operations. It also allows them to improve the practices of cyber security and implement the better strategies to reduce the threats.

23

Why is Python utilized for hacking?

Reference answer

Python provides simplicity and the reader will be able to complete their task faster and easier. Python libraries are also used for coding, recording, network scanning, and network attack.

24

What is Vulnerability Selling?

Reference answer

Vulnerability Selling refers to the commercial market for security vulnerabilities, where researchers sell discovered flaws instead of reporting them freely. This includes legitimate channels like bug bounty programs and vulnerability acquisition platforms (Zerodium, Trend Micro's ZDI), as well as gray/black markets where vulnerabilities are sold to governments, brokers, or criminal groups. Prices vary from hundreds to millions of dollars based on the target software, exploit reliability, and exclusivity.

25

What are the differences between symmetric and asymmetric encryption? And which is better?

Reference answer

Symmetric encryption is a type of encryption that uses a single key, a secret key, to both encrypt and decrypt electronic information. Entities communicating via symmetric encryption must exchange the key so they can be used in the decryption process. On the other hand, Asymmetric encryption uses two keys, one public and one private, to encrypt and decrypt messages. While the symmetric encryption is faster, the key needs to be transferred using an unencrypted channel, the asymmetric encryption is slower but more secure. Each has its pros and cons, which means a better approach is to combine the two types of encryption. This means we'll need to set up a channel with asymmetric encryption and send the data using a symmetric process.

26

What is Defense in Depth (DiD)?

Reference answer

Defense in Depth (DiD) is a cybersecurity approach that involves the implementation of a series of layered defensive mechanisms to secure valuable data and information. If one mechanism fails, another takes over immediately to prevent unprecedented attacks. This multi-layered approach, also known as the castle approach, significantly enhances the security of a system.

27

What are the best practices for hardening a web server?

Reference answer

Hardening a web server involves securing its configuration to minimize vulnerabilities and protect against attacks. Best practices include: - Keep software and patches up to date. - Disable unused services and modules. - Implement strong authentication methods, including multi-factor authentication. - Assign least privileges to users and processes. - Use firewalls to block unwanted traffic. - Enable SSL/TLS for secure communication. - Restrict access to sensitive files with proper permissions. - Disable directory listing and unnecessary HTTP methods. - Hide server version details and configure error handling securely. - Regularly back up server data for recovery. These steps reduce vulnerabilities and enhance overall server security.

28

What are some certifications for penetration testers?

Reference answer

Several certifications can validate penetration testing skills, including: - CompTIA PenTest+: Covers essential penetration testing knowledge and skills. - Offensive Security Certified Professional (OSCP): Highly regarded and challenging certification with practical hands-on testing. - Certified Ethical Hacker (CEH): Offers a comprehensive understanding of ethical hacking concepts and techniques. - GIAC Penetration Tester (GPEN): Focuses on practical penetration testing skills and methodologies. - CREST Certified Penetration Tester (CCT): Recognizes proficiency in penetration testing across various domains.

29

What is the difference between a CIO and a CTO?

Reference answer

CIO (Chief Information Officer): Manages overall IT strategy and operations, focusing on technology alignment with business goals rather than just security. CTO (Chief Technology Officer): Drives technology innovation and product development, focusing on technical architecture and emerging technologies.

30

What is a honeypot?

Reference answer

A honeypot is a decoy system designed to attract and analyze cyber attackers' tactics.

31

What Should a Pentest Report Include?

Reference answer

A professional report usually contains: 1. Executive Summary: Non-technical overview, business impact, overall risk posture. 2. Scope & Methodology: Assets tested, testing approach, limitations. 3. Findings Summary: Vulnerability list, severity ratings. 4. Technical Details: For each vulnerability: description, affected assets, steps to reproduce, proof of concept, screenshots. 5. Risk Impact: Data exposure, financial damage, operational risk. 6. Remediation Steps: Fix recommendations, security controls.

32

What is the OSI model and what are its layers?

Reference answer

The OSI (Open Systems Interconnection) model is a conceptual framework for understanding network communication, consisting of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

33

What is your general methodology for conducting a penetration test?

Reference answer

A strong candidate will describe a structured approach, often starting with reconnaissance to gather information about the target. This is followed by scanning to identify vulnerabilities, exploitation to test these vulnerabilities, and finally reporting to document findings and provide recommendations. Look for candidates who mention methodologies like OSSTMM (Open Source Security Testing Methodology Manual) or NIST (National Institute of Standards and Technology) guidelines.

34

What is the difference between a finding and a vulnerability?

Reference answer

A finding is a potential security issue identified during a penetration test, while a vulnerability is a confirmed weakness in a system that can be exploited.

35

What are the different types of penetration testing?

Reference answer

The different types of penetration testing include black-box testing, where the tester has no prior knowledge of the system; white-box testing, where the tester has full knowledge; and grey-box testing, where the tester has partial knowledge. Other types include external testing, internal testing, and targeted testing.

36

Can you think of a situation where innovation was required at work? What did you do in this situation?

Reference answer

Additional behavioral questions include: - Your initial penetration test proposal is heavily criticized by your manager. How have you adapted to negative feedback in the past? - Describe a situation where you were able to use persuasion to successfully convince someone to see things your way. - Can you think of a situation where innovation was required at work? What did you do in this situation?

37

How do you secure a web server?

Reference answer

- Regular software updates and patching - Using HTTPS and SSL/TLS encryption - Setting up firewalls and intrusion detection systems - Restricting access to only necessary users - Regular security audits and penetration testing

38

Do you have any certifications in this area?

Reference answer

Certifications play a significant role in establishing credibility and demonstrating expertise in the field of penetration testing. Industry-recognized certifications such as the Offensive Security Certified Professional (OSCP), Certified Ethical Hacker (CEH), and GIAC Penetration Tester (GPEN) are highly valued. These certifications validate technical skills, practical knowledge, and hands-on experience with real-world scenarios. If you hold any of these or similar certifications, they not only boost your professional profile but also enhance trust among clients and employers.

39

What are white hat, black hat, and gray hat hackers?

Reference answer

- White Hat: Ethical hackers authorized to identify and fix vulnerabilities. - Black Hat: Unauthorized hackers who exploit vulnerabilities for malicious purposes. - Gray Hat: Hackers who sometimes operate legally but may also breach security without malicious intent.

40

Discuss Linux Hardening Methods?

Reference answer

Linux Hardening Methods are a must for every Linux System Administrator. These methods help in protecting the system from various threats and vulnerabilities. Linux Hardening Methods can be broadly classified into two categories: - Mandatory: Mandatory Linux hardening methods can help to protect your system from various attacks and vulnerabilities. By installing security updates and security enhancements, as well as disabling unnecessary services, and removing unneeded files, you can tighten the security of your system. - Recommended: The recommended hardening of the Linux system is to install security-enhancing software. This software will protect the system from known attacks and vulnerabilities. Some of the most common security-enhancing software applications are antivirus, firewalls, and intrusion prevention systems. It is important to carefully select the appropriate software for your system, in order to achieve the best results.

41

What is network security, and what are its types?

Reference answer

Network security is essentially a set of rules and configurations formulated to protect the accessibility, confidentiality, and integrity of computer networks and data with the help of software and hardware technologies. Types of network security: Network access control: To prevent attackers and infiltrations in the network, network access control policies are in place for both users and devices at the most granular level. For example, access authority to network and confidential files can be assigned and regulated as needed. Antivirus and antimalware software: Antivirus and antimalware software are used to continuously scan and protect against malicious software, viruses, worms, ransomware, and trojans. Firewall protection: Firewalls act as a barrier between your trusted internal network and an untrusted external network. Administrators can configure a set of defined rules for the permission of traffic into the network. Virtual private networks (VPNs): VPNs form a connection to the network from another endpoint or site. For example, an employee working from home uses a VPN to connect to the organization's network. The user would need to authenticate to allow this communication. The data between the two points is encrypted.

42

What tools would you use to perform testing against WiFi networks

Reference answer

Aircrack-ng is a complete suite of tools used to assess WiFi network security and test for various vulnerabilities.

43

What are your ethical hacking certifications (if any)?

Reference answer

I hold certifications such as CEH (Certified Ethical Hacker), CompTIA Security+, and am working towards OSCP (Offensive Security Certified Professional). These certifications validate my knowledge of ethical hacking methodologies, tools, and legal frameworks.

44

List out some methods for password hacking?

Reference answer

- USB Drives and Social Engineering: USB Drives are becoming more and more popular as storage devices for computers. USB drives come in a variety of shapes and sizes, making them convenient to carry around with you wherever you go. Social engineering is the practice of manipulating someone into revealing personal information or performing an act against their will by exploiting vulnerabilities in that person's behavior or attitudes. - DiskFiltration Attacks: DiskFiltration attacks can be carried out using various means such as malware infection, spyware installation, and spear-phishing emails sent to employees. They are used in order to gain access to sensitive information or compromise the security of systems. - Analyzing Fans With Fansmitter: Fansmitter is a social media analysis tool that helps organizations understand their fans. It allows administrators to identify, track, and analyze the behavior of their followers on various social networks. Fansmitter also provides insights into what content resonates with them and where they are spending their time online. - BitWhisper- BitWhisper is a popular ethical hacking tool that helps hackers to scan for vulnerabilities on the targeted computer. It uses social engineering and penetration testing techniques in order to identify weak points in an organization's security.BitWhisper can also be used by businesses as part of their risk assessment process.

45

What are the different phases of penetration testing?

Reference answer

Penetration testing typically involves several structured phases to ensure a comprehensive assessment. These phases include: - Planning and Reconnaissance: During this initial stage, the goals and scope of the test are defined in collaboration with the client, including the systems to be examined and test methods to be used. Ethical hackers also gather preliminary information about the target system, such as network architecture, domain details, and potential vulnerabilities. - Scanning: This phase focuses on identifying how the target system responds to various intrusion attempts. Tools and techniques like static and dynamic analysis are used to evaluate how the system behaves and to map potential entry points. - Gaining Access: Once vulnerabilities are identified, ethical hackers attempt to exploit them to gain access to the system. This phase may include launching attacks such as SQL injection, cross-site scripting (XSS), or phishing to penetrate the system. - Maintaining Access: After successfully gaining access, testers simulate advanced persistent threats by attempting to remain within the system undetected over an extended period. This helps evaluate the system's ability to detect and respond to unauthorized access. - Analysis and Reporting: The final phase involves compiling a detailed report of the findings, including vulnerabilities discovered, data accessed, and recommendations for remediation. This documentation helps the organization strengthen its defenses and mitigate risks effectively.

46

What is a Configuration Attack?

Reference answer

This type of attack involves exploiting vulnerabilities in the configuration of a device, computer, or system to gain unauthorized access or disrupt its functionality.

47

What is data packet sniffing?

Reference answer

Packet sniffing is a technique used to capture and analyze data packets as they are traveling across a network. The process can be used for diagnostic, monitoring, security (i.e., pentesting)., or malicious purposes. When performing packet sniffing, the device's network interface card (NIC) is set to promiscuous mode, which allows it to capture all packets on the network regardless of their destination. The packet sniffing tool is used to intercept and copy data packets on the same network segment where the device is connected. This can include packets not destined for the device running the sniffing tool. These packets are then analyzed offline for purposes such as troubleshooting network issues, monitoring network performance, or extracting sensitive information (such as credentials if we are performing a penetration test). The process may also be used by malicious actors to attempt to intercept sensitive data. Packet sniffing can be countered by ensuring that secure network protocols and strong encryption are employed across the network. An Intrusion Detection System (IDS) can also be used to alert administrators to malicious packet sniffing activities.

48

Client Refuses to Patch Critical Vulnerability

Reference answer

Good response includes: Document risk clearly, provide business impact, offer remediation alternatives, get formal risk acceptance sign-off. Shows consulting maturity — not just hacking skill.

49

What is API penetration testing?

Reference answer

API testing focuses on authentication, authorization, data exposure, and input validation issues.

50

How do ethical hackers stay within legal boundaries

Reference answer

Ethical hackers always work with written permission and defined scope. Without that approval even skilled testing becomes illegal regardless of intention.

51

Explain Rootkit Countermeasures in ethical hacking?

Reference answer

A rootkit is a type of malicious software that hides from detection by OS security features. Rootkits have been used for years to secretly install malware on computers without the user's knowledge or consent. Today, they are also being used as tools for cybercrime and espionage. Rootkit countermeasures (RKC) are a key part of ethical hacking because they allow systems administrators to detect and remove rootkits before they can do damage. RKC techniques can be divided into two main categories: signature-based methods and heuristic methods. When it comes to conducting ethical hacking tasks, the installation of a rootkit countermeasure is one of the most important measures that are taken. Rooting and removing a rootkit are the two most important countermeasures that need to be taken in order to protect the computer system from being compromised.

52

How Do You Stay Updated in Cybersecurity?

Reference answer

Strong candidates mention: security blogs, research papers, CVE databases, exploit releases, conference talks, labs & simulations. This shows continuous learning — critical in offensive security.

53

What is the purpose of a vulnerability assessment?

Reference answer

A vulnerability assessment is a systematic review of security weaknesses in an information system. It helps identify, quantify, and prioritize vulnerabilities, providing the organization with the necessary knowledge to improve its security posture.

54

What are HTTP response status codes?

Reference answer

Common HTTP status codes include: - 200: Success - 301/302: Redirect - 401: Unauthorized - 403: Forbidden - 404: Not Found - 500: Server Error

55

What is DNS spoofing, and how can it be prevented?

Reference answer

DNS spoofing is a type of attack where an attacker tricks a DNS server into resolving a legitimate domain name to a fake IP address. It can be prevented by implementing DNS security extensions like DNSSEC.

56

What are your career goals in cybersecurity?

Reference answer

My short-term goal is to gain practical experience as an ethical hacker, refining my penetration testing skills and earning advanced certifications like OSCP. Long-term, I aim to specialize in advanced threat analysis or red team operations and eventually contribute to cybersecurity research, helping organizations stay ahead of evolving threats.

57

Top 10 Penetration Testing Job Interview Questions and their Answers.

Reference answer

Let me know more questions and Answers will be added in the article. https://hackersonlineclub.com/penetration-testing-job.../

58

What is an SQL injection, and how does it work?

Reference answer

A SQL injection is a type of vulnerability that occurs when an attacker injects malicious SQL code into a web application, potentially allowing access to sensitive data.

59

What are the different package managers used in Linux and where are they used?

Reference answer

Common Linux package managers include apt (Debian/Ubuntu), yum/dnf (Fedora/RHEL), pacman (Arch), and zypper (openSUSE), used to install, update, and manage software packages.

60

How does HMAC (Hashed Message Authentication Code) work?

Reference answer

HMAC is a mechanism used to verify both the integrity and authenticity of a message. It combines a cryptographic hash function with a secret key to generate a hash value (the HMAC). Here's how it works: Step 1: The secret key is combined with the message in a specific way, often by padding or mixing the key with the message data. Step 2: The combined key and message are passed through a cryptographic hash function (e.g., SHA-256) to produce an intermediate hash value. Step 3: The HMAC process uses two rounds of hashing: - The inner hash is generated by hashing the combination of the key and message. - The outer hash is produced by hashing the inner hash combined with the key again. Step 4: The result is a fixed-size hash value that serves as the HMAC, which is sent alongside the message. The receiver, who knows the shared secret key, can replicate the process and compare the HMAC values. It ensures the message has not been tampered with and is from the authentic sender.

61

What is SQL Injection?

Reference answer

SQL Injection is an attack method where malicious SQL code is inserted into input fields to access, manipulate, or damage database content.

62

What tools are commonly used for penetration testing?

Reference answer

Common tools include Nmap, Metasploit, Burp Suite, Wireshark, John the Ripper, and Nessus.

63

What are common tools used to secure a standard network?

Reference answer

Tools include firewalls, password managers, IDS and IPS, end-point antiviruses, as well as security policies and procedures.

64

Difference between active and passive reconnaissance

Reference answer

During active reconnaissance, the attacker will perform scans or tests that will interact with the target machine, potentially triggering alarms or creating logs, whereas during passive reconnaissance the attacker makes use of open source intelligence to gather information about the target.

65

How would you discover hosts on a network you are unfamiliar with?

Reference answer

Host discovery is one of the first steps when performing a penetration test. To do this effectively, you need to understand how networks work and how you can use tools like Nmap and Zenmap to discover hosts. You can learn how to do this using Nmap in Nmap Host Discovery: Your First Step in Ethical Hacking.

66

What is the difference between symmetric and asymmetric encryption?

Reference answer

Symmetric encryption uses one key for both encryption and decryption, while asymmetric uses a public and private key pair.

67

Have you ever participated in Capture the Flag (CTF) or other online hacking games?

Reference answer

Additional personal questions include: - What are some of your favorite penetration testing tools? - Have you ever participated in Capture the Flag (CTF) or other online hacking games? - Do you know any programming or scripting languages?

68

What is Diffie-Hellman exchange?

Reference answer

The Diffie-Hellman exchange is a cryptographic method that allows two parties to securely share a secret over an unsecured communication channel. It enables the creation of a shared encryption key without the need to transmit the key itself, ensuring confidentiality. This exchange relies on complex mathematical principles, such as modular arithmetic and discrete logarithms, making it a fundamental technique in secure communications.

69

What Are Some Common Abbreviations Used in Penetration Testing?

Reference answer

Penetration testing uses many abbreviations, including 2FA (Two-Factor Authentication), IDS (Intrusion Detection System), SQLi (SQL Injection), and XSS (Cross-Site Scripting). Knowing these terms is essential for clear communication with security teams during testing and reporting.

70

How can penetration testing support incident response exercises?

Reference answer

Penetration testing can be used to simulate real-world attacks and test an organization's incident response plan, identify vulnerabilities, and improve response times.

71

Explain what Brute Force Hack is.

Reference answer

A brute force attack is a type of cyber attack that involves attempting to guess a password or key by trying every possible combination until the correct one is found. These attacks can be used to gain unauthorized access to a system or to decrypt sensitive data. Brute force attacks can be time-consuming and may be detected and stopped by security measures such as rate-limiting or account lockouts.

72

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

73

What is a MAC address?

Reference answer

A MAC (Media Access Control) address is a unique hardware identifier assigned to network interfaces for communication at the data link layer.

74

What are common compliance frameworks?

Reference answer

Common compliance frameworks include - ISO 27001: ISO 27001, which provides a standard for information security management systems, and SOC 2, which focuses on data security and privacy for service providers. - HIPAA: HIPAA ensure the protection of healthcare information, - PCI DSS: PCI DSS is crucial for securing payment card transactions. - SOX: SOX (Sarbanes-Oxley Act), which is designed to protect investors by ensuring the accuracy and reliability of corporate financial reporting. - GDPR: GDPR (General Data Protection Regulation) is a pivotal framework for data privacy and protection, particularly in the European Union. These frameworks help organizations structure their security practices to meet industry standards and regulatory requirements.

75

What skills do you think certified ethical hackers need to be successful?

Reference answer

Reveals an understanding of the role and highlights the candidate's skills.

76

What are the different types of attacks that can be launched against a website?

Reference answer

Websites can be targets for a variety of attacks, including: - Cross-site scripting (XSS): Injects malicious scripts into web pages to steal data or hijack accounts. - SQL injection: Exploits vulnerabilities in databases to access or manipulate sensitive information. - Denial-of-service (DoS): Overwhelms the website with traffic, making it unavailable to legitimate users. - Brute force attacks: Repeatedly tries different passwords or combinations to gain unauthorized access. - Session hijacking: Steals a user's active session to gain access to their account. - Clickjacking: Tricks users into clicking malicious links or buttons disguised as legitimate ones.

77

What is SSL Stripping in penetration testing?

Reference answer

SSL stripping is a type of man-in-the-middle (MITM) attack used in penetration testing to downgrade secure HTTPS connections to unprotected HTTP connections. During this process, attackers intercept and modify the communication between a client and a server, removing the encryption layer provided by SSL/TLS. This allows sensitive data, such as login credentials and personal information, to be transmitted in plain text, making it easier for attackers to steal or manipulate the information.

78

What Tools Do You Use for Penetration Testing, and Why?

Reference answer

Candidates should mention a variety of tools, such as Nmap, Metasploit, Burp Suite, and Wireshark. A strong answer will explain why they prefer certain tools and how they use them effectively in different scenarios.

79

What tools do you use for vulnerability scanning, and why?

Reference answer

Look for: Practical experience with these tools. What to Expect: Mention of tools like Nessus, OpenVAS, and Qualys, and reasons for their selection based on accuracy, comprehensiveness, and ease of use.

80

What Is XAMPP in Penetration Testing?

Reference answer

XAMPP is an open-source web server platform used for local development and testing. It includes Apache, MySQL, PHP, and Perl. Penetration testers use XAMPP to simulate vulnerable environments, test web applications, and identify security flaws in a controlled setup.

81

What is ethical hacking?

Reference answer

Ethical hacking involves authorized testing of systems to improve security.

82

How are penetration tests classified?

Reference answer

Penetration tests are classified based on the level of information provided to the tester: black box (no prior knowledge), white box (full knowledge), and gray box (partial knowledge).

83

How Do You Calculate CVSS Score?

Reference answer

CVSS (Common Vulnerability Scoring System) measures severity based on: attack vector, complexity, privileges required, user interaction, and impact on CIA triad (Confidentiality, Integrity, Availability). Interviewers want you to understand risk ranking — not memorize numbers.

84

You Find an Open SMB Share. What Next?

Reference answer

Strong answer path: Anonymous login attempt, share listing, sensitive file discovery, credential harvesting, password reuse testing, lateral movement. Bonus points if you mention group policy files, backup configs, and scripts with credentials.

85

What is the difference between WEP, WPA and WPA2

Reference answer

WEP uses the RC4 (Rivest Cipher 4) stream cipher for authentication and encryption. The standard originally specified a 40-bit, pre-shared encryption key, later on a 104-bit key became available. WPA is also based on RC4, although it introduced Temporal Key Integrity Protocol (TKIP), which uses 256-bit keys to encrypt data, along with other key features such as per-packet key mixing which make it a much better option. WPA2 replaced RC4 and TKIP with two stronger encryption and authentication mechanisms: Advanced Encryption Standard (AES) and Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP), respectively. Also meant to be backward-compatible, WPA2 supports TKIP as a fallback if a device cannot support CCMP. AES comprises three symmetric block ciphers. Each encrypts and decrypts data in blocks of 128 bits using 128-, 192- and 256-bit keys.

86

What is IoT security testing?

Reference answer

IoT security testing involves assessing Internet of Things (IoT) devices and their associated systems to identify vulnerabilities, ensure data protection, and maintain overall security. This process includes evaluating hardware, firmware, software, and network configurations for potential flaws that could be exploited by attackers. Key aspects of IoT security testing may include encryption validation, authentication protocols, vulnerability scanning, and penetration testing. By conducting comprehensive IoT security testing, organizations can mitigate risks, safeguard sensitive data, and ensure the reliability of connected devices in diverse environments.

87

What is the difference between vulnerability scanning and penetration testing?

Reference answer

Vulnerability scanning is the process of identifying vulnerabilities in a system or network using automated tools. Penetration testing involves simulating an attack to exploit vulnerabilities and testing the effectiveness of the security measures in place.

88

What do you mean by SSRF?

Reference answer

Web applications can be vulnerable to Server-Side Request Forgery (SSRF), which enables an attacker to inject unauthorized requests into the application and grant unauthorized access to modify data. A user can be misled into sending a specifically designed query to the server, which an attacker can then use to take advantage of this vulnerability. Cross-site scripting (XSS) attacks frequently include SSRF attacks.

89

What is the objective of penetration testing?

Reference answer

Penetration testing helps identify and exploit security vulnerabilities in systems, networks, or applications. It can be used to assess the resilience of systems against real-world cyberattacks. Organizations can uncover weaknesses, evaluate security controls, and augment defenses before attackers can exploit them.

90

In what format are Windows and Linux hashes stored

Reference answer

Windows hashes are stored using NTLM and they used to be stored with LM. Linux passwords are normally hashed using the SHA-256 or SHA-512, in older versions they are hashed with Blowfish or DES.

91

What is the difference between symmetric and asymmetric encryption?

Reference answer

Symmetric and asymmetric encryption differ in how they use keys for encryption and decryption. - Symmetric Encryption: Symmetric encryption relies on a single key that both encrypts and decrypts the data, making it faster but requiring secure key exchange. - Asymmetric Encryption: On the other hand, asymmetric encryption uses a pair of keys—a public key for encryption and a private key for decryption—offering enhanced security for key exchange but being comparatively slower.

92

How SSL/TLS works?

Reference answer

SSL/TLS establishes secure connections through symmetric and asymmetric encryption during a handshake process.

93

Why do interviews test communication skills

Reference answer

Findings mean nothing if they cannot be explained clearly. Ethical hackers often brief non technical teams.

94

What are the five stages of ethical hacking?

Reference answer

- Reconnaissance – Gathering information about the target system. - Scanning – Identifying network vulnerabilities. - Gaining Access – Exploiting weaknesses to enter the system. - Maintaining Access – Establishing persistent access to assess long-term risks. - Covering Tracks – Clearing logs and traces of hacking activity.

95

How do you protect a network from Distributed Denial of Service (DDoS) attacks?

Reference answer

To protect a network from DDoS attacks: - Deploy firewalls and IDS to filter malicious traffic. - Use load balancers to distribute traffic across servers. - Implement rate limiting to control request frequency. - Leverage CDNs to absorb attacks at the network edge. - Apply Anycast routing to distribute traffic across data centers. - Set up WAFs to block malicious web traffic. - Use DDoS protection services to handle large-scale attacks. - Monitor traffic for abnormal spikes. - Have an incident response plan for quick recovery. These methods help minimize the impact of DDoS attacks and maintain network availability.

96

What is Vulnerability Publication?

Reference answer

Vulnerability Publication is the process of publicly disclosing security vulnerability details after following responsible disclosure timelines. This includes publishing technical write-ups, proof-of-concept code, and remediation guidance through security advisories, CVE entries, conference presentations, or blog posts. Publications typically occur after vendors have patched the issue (usually 90-120 days) to balance transparency with user safety.

97

What is port blocking within LAN?

Reference answer

Port blocking in LAN means restricting users' access to several services within the local area network.

98

What is scanning in ethical hacking

Reference answer

Scanning is the stage where tools are used to identify live systems to open ports and services so testers know where possible entry points exist.

99

What is an intrusion detection system (IDS)?

Reference answer

An IDS monitors network traffic for suspicious activity and alerts administrators, but does not block traffic.

100

How is the severity of a security vulnerability determined?

Reference answer

The severity of a security vulnerability is determined by assessing its potential impact on the target system or network, as well as the ease with which it can be exploited. Severity is often classified as low, medium, or high, depending on the level of risk involved.

101

What is the CIA triad in information security?

Reference answer

The CIA triad is a model for information security that consists of three components: Confidentiality, Integrity, and Availability. - Confidentiality means that sensitive information is protected from unauthorized access and is only available to authorized individuals. - Integrity ensures that the data remains unaltered and uncorrupted and that it is not subject to unauthorized modifications during transmission. - Availability refers to the ability of authorized users to access the information they need when they need it. This includes ensuring that systems, networks, and data are reliable, and that data can be recovered in the event of a disaster.

102

What is sniffing? Explain its types in Ethical Hacking.

Reference answer

Sniffing in Ethical Hacking is a method implemented for monitoring all the data packets that pass through a particular network. Sniffers are primarily used to oversee and troubleshoot network traffic, and Network/System Administrators are responsible for this role. Sniffers can be installed in the system in the form of software or hardware. However, attackers can misuse sniffers to gain access to data packets that contain sensitive information, such as account information, passwords, etc. Packet sniffers on a network can give a malicious hacker the opportunity to intrude and access all of the network traffic. There are two types of sniffing: Active sniffing: Sniffing in a point-to-point network device called the switch is referred to as active sniffing. The switch is responsible for the regulation of the data flow between its ports. This is done through the active monitoring of the MAC address on each port, which enables the passing of data only to the intended target. To activate the sniffing of the traffic between targets, sniffers have to inject traffic into the LAN. Passive sniffing: Passive sniffing happens when the sniffing is done through the hub. The traffic that goes through the unbridged network or the non-switched segment is transparent to all machines in that segment. Here, sniffers work at the network's data link layer. This is called passive sniffing as sniffers set up by the attackers passively wait for the data to capture them when they are sent.

103

What Is the Method of Finding the Attack String in Memory?

Reference answer

Finding an attack string in memory involves identifying specific patterns or byte sequences used in exploits. Penetration testers use memory analysis tools to locate these strings, helping them detect and reverse-engineer malware, exploits, and suspicious code.

104

How would you remotely access a service that can only be accessed from within an internal network?

Reference answer

You would use a jump box or SSH tunneling (port forwarding) to route traffic through an accessible host within the internal network.

105

How do you mitigate the risk of Kerberoasting?

Reference answer

Kerberoasting leverages a feature that is needed to make Kerberoast authentication work, so you can't just turn something off to make it go away. The best you can do is use long, complex passphrases at least 30 characters long with a mix of character types, then regularly update these passwords for your service accounts. Their is a technology that automates this process called Managed Service Accounts (MSAs). It also helps that Kerberos service tickets use AES encryption as opposed to RC4 encryption to make it harder to crack offline. It is extremely important that service accounts have the minimum permissions to perform their tasks a la principal of least privilege. Do not put your service accounts in the Domain Admins group.

106

What is the benefit of social engineering in ethical hacking?

Reference answer

Attackers exploit trust as well as curiosity or fear to gain access without technical attacks thus social engineering acts as a first line of defence against malicious attackers.

107

What is ethical hacking and what are its key principles?

Reference answer

Ethical hacking is the practice of identifying and exploiting vulnerabilities in computer systems and networks with the owner's permission to improve their security. The key principles of ethical hacking include obtaining written consent, minimizing impact on the target system, and keeping all sensitive information confidential.

108

Describe the Frame Injection Vulnerability.

Reference answer

A security flaw known as a frame injection vulnerability allows an attacker to insert any frames they choose into the traffic flowing through a website or application. This can be done by altering the components of an HTTP request header or by adding frames to the response the server sends to the browser.

109

Explain the OSI model and its relevance to ethical hacking.

Reference answer

The OSI (Open Systems Interconnection) model categorizes network communication into seven layers. Ethical hackers use this model to identify vulnerabilities at different layers and implement security measures effectively.

110

How do wireless sniffers detect SSIDs?

Reference answer

Wireless sniffers detect SSIDs by capturing Wi-Fi packets transmitted between devices and access points. They primarily rely on passive scanning, where they listen to beacon frames broadcasted by routers, which contain SSIDs. Additionally, sniffers use active probing by sending probe requests to elicit responses from access points, even if SSID broadcasting is disabled. Another method is packet inspection, where authentication and association frames are analyzed to extract SSIDs. In some cases, sniffers attempt decryption on weakly secured networks to uncover SSIDs from data packets. These techniques make SSID hiding an ineffective security measure, emphasizing the need for stronger encryption and authentication protocols.

111

What is ethical hacking?

Reference answer

Ethical hacking is the practice of legally probing computer systems and networks to identify and fix security vulnerabilities. With hands-on learning and expert guidance, Ethical Hacking Online Training helps individuals gain practical knowledge to secure networks and protect sensitive data.

112

What is the purpose of a penetration testing report?

Reference answer

The purpose of a penetration testing report is to provide stakeholders with a comprehensive understanding of the security posture of a system, including identified vulnerabilities and recommended remediation.

113

What is SQL Injection?

Reference answer

SQL Injection occurs when unsanitized user input is executed as database queries. Impact: authentication bypass, data extraction, database modification, remote command execution (in some cases). Types Interviewers Expect You to Know: Error-based SQLi, Union-based SQLi, Blind SQLi (Boolean), Time-based SQLi, Out-of-band SQLi.

114

What Happens During a Port Scan?

Reference answer

Port scanning involves sending packets to target ports, observing responses, identifying open services, and mapping the attack surface. Mention scan types: SYN scan, TCP connect scan, UDP scan, FIN scan.

115

How Do You Enumerate Active Directory?

Reference answer

Strong answers include multiple techniques: User Enumeration: LDAP queries, SMB enumeration, Kerberos pre-auth attacks. Domain Enumeration: Trust relationships, domain controllers, group memberships. Tools: enum4linux, ldapsearch, CrackMapExec.

116

How would you test both a client's internal and external networks effectively?

Reference answer

You start with external testing to identify vulnerabilities exposed to outside attackers, then move to internal testing to simulate insider threats. You focus on critical systems and high-risk assets, documenting all findings in detail. You provide clear recommendations for remediation, including patch management, network segmentation, user access controls, and staff awareness, and verify that the suggested fixes effectively address the risks.

117

What Is Penetration Testing?

Reference answer

Penetration testing, also known as pentesting, is a cybersecurity practice that detects vulnerabilities in systems, applications, and networks. Ethical hackers simulate real-world attacks to identify security gaps. It helps organizations strengthen their defenses, reduce risks, and prevent potential breaches through proactive security measures and timely fixes.

118

What measures can organizations take to defend against social engineering attacks?

Reference answer

Look for: Practical and actionable advice. What to Expect: Recommendations such as employee training, implementing multi-factor authentication (MFA), and conducting regular security awareness programs.

119

What is your approach to exploiting vulnerabilities during a penetration test?

Reference answer

My approach involves identifying vulnerabilities through reconnaissance and scanning, selecting appropriate exploits, executing them to test their effectiveness, and documenting the results to provide actionable insights for remediation.

120

What is the point of a sandbox technique for protection?

Reference answer

Sandboxing lets suspicious files run in a contained environment. This allows teams to watch behavior in a safe way before deciding if something is malicious.

121

How can you prevent an XSS attack?

Reference answer

If the organization uses anti-XSS tools, I'd use those tools to create high-level encryption and prevent XSS attacks. If the company doesn't have anti-XSS tools, I'd create and enforce measures that guarantee user input validation and set up a CSP (content security policy) for the firm's network. After that, I'd encode special characters.

122

Explain what SSDP is.

Reference answer

SSDP stands for Simple Service Discovery Protocol, which is a network protocol that uses the internet protocol suite to discover network services and information and for advertisement purposes.

123

Authentication vs Authorization Flaws

Reference answer

Authentication verifies identity (login process, 'Who are you?'). Authorization verifies permissions (access control, 'What can you access?'). Broken authorization leads to IDOR, privilege escalation, and data exposure.

124

Featured Program

Reference answer

Build real-world cyber security skills through a structured curriculum, guided labs, and mentorship built for job-ready outcomes.

125

What is the difference between white-hat, black-hat, and gray-hat hackers?

Reference answer

White-hat hackers (ethical hackers) are authorized to hack into systems to find vulnerabilities and improve security. Black-hat hackers act maliciously and illegally for personal gain or harm. Gray-hat hackers fall between, often hacking without permission but not with malicious intent, sometimes reporting vulnerabilities after the fact.

126

What is ARP poisoning?

Reference answer

ARP (Address Resolution Protocol) links IP addresses to MAC addresses on a local network. In ARP poisoning, the attacker sends fake ARP replies to associate their MAC address with a legitimate IP, so all traffic meant for that IP flows through the attacker first. Prevention includes using dynamic ARP inspection on switches and static ARP entries for critical devices.

127

Why do companies value ethical hacking reports

Reference answer

Reports translate technical findings into business impact. Management understands risks better when issues are explained clearly rather than technically overloaded.

128

What do you value most in a workplace and its culture?

Reference answer

Additional culture fit questions include: - What attracted you to our company and its culture? - What do you value most in a workplace and its culture? - How do you handle failure or setbacks in your work? Can you provide an example?

129

What is a rogue access point, and how can it be prevented?

Reference answer

A rogue access point is a fake Wi-Fi hotspot that tries to trick users into connecting, allowing attackers to intercept data. It can be prevented by implementing wireless intrusion detection systems and educating users about the risks of public Wi-Fi.

130

Define the CIA Triad, and provide an example of each component.

Reference answer

Just like above, this question tests your basic knowledge of a popular cyber security topic. You should be able to list the components of this information security model and describe each in detail with an example. You can learn about the CIA triad here.

131

What is Burp Suite?

Reference answer

Burp Suite is a collection of tools used to test whether access to a web application has been compromised. It was developed by a company called Portswigger, also named after its founder. Burp Suite aims to have it all in one set of tools and BApps.

132

BloodHound Usage

Reference answer

BloodHound maps AD attack paths visually. It identifies privilege escalation paths, misconfigured trusts, and admin access chains. It answers: "How do I go from low user → Domain Admin?"

133

What is Wireshark, and how does it work?

Reference answer

Wireshark is a network protocol analyzer that helps penetration testers capture and analyze network traffic.

134

What are your thoughts on ChatGPT for penetration testing?

Reference answer

Artificial Intelligence (AI) is a trending topic in technology. You will be expected to have a general understanding of major trending topics like this, and a good way to demonstrate this knowledge is by having thoughts on how tools like ChatGPT may affect penetration testing. To find out how ChatGPT can be used for hacking, read Unlock ChatGPT for Hacking: Jailbreaking Ethical Restrictions.

135

What is Cross-Origin Resource Sharing (CORS)?

Reference answer

Cross-Origin Resource Sharing (CORS) is a security feature implemented by web browsers that allows a server to specify which origins are permitted to access its resources. By default, web browsers block resource sharing across different domains to prevent potential security risks such as cross-site request forgery (CSRF). CORS acts as a controlled mechanism, enabling developers to explicitly allow specific domains or methods to bypass the same-origin policy. This is achieved by setting appropriate HTTP headers like `Access-Control-Allow-Origin`. These headers define the rules for how requests from external origins are handled, ensuring both functionality and security.

136

What is Burp Suite used for?

Reference answer

Burp Suite is a web application security testing tool that provides: - Proxy functionality - Scanner - Intruder - Repeater - Decoder/Encoder

137

What is XSS? What are the three types?

Reference answer

XSS stands for Cross-Site Scripting. The basic idea of an attacker is to inject JavaScript code into the application. The code can perform various actions like stealing cookies, bypassing SOP, etc. Three types: a) Persistent / Stored: The malicious JavaScript code gets stored (e.g., Name on Profile Page). b) Reflected XSS: The malicious JavaScript code is not stored but is reflected as an error or value (e.g., search functionality on a website). c) DOM-based XSS: JavaScript mishandles the input, and the attacker tries to access and maliciously modify the end-user input. It can be found in Document.url, Document.location, etc.

138

What is a zero-day vulnerability?

Reference answer

A zero-day vulnerability is a previously unknown flaw that attackers can exploit before a patch or fix is available.

139

What are some commonly used tools in penetration testing, and what are their functions?

Reference answer

Common tools include Nmap for network scanning, Burp Suite for web application testing, Metasploit for exploiting vulnerabilities, Nessus for vulnerability scanning, and OWASP ZAP for web security testing. Each tool serves a specific purpose in the penetration testing process.

140

What are the main transmission modes between devices in a computer network?

Reference answer

The three transmission modes are the Simplex Mode, the Half-Duplex Mode, and the Full-Duplex Mode. In the Simplex Mode, data can be sent in only one direction. That is, the message cannot be sent back to the sender. In a Half-Duplex Mode, the data can be transmitted in two directions using a signal carrier. However, the transmission cannot be done in both directions at the same time. In the Full-Duplex Mode, the data is bidirectional, that is, it can be sent in both directions at the same time.

141

What is ethical hacking, and how does it differ from malicious hacking?

Reference answer

Ethical hacking is the practice of legally testing systems for vulnerabilities with the permission of the system owner. In contrast, malicious hacking involves unauthorized access and exploitation of systems for personal gain.

142

What is Same-Origin Policy?

Reference answer

The Same-Origin Policy is a critical security concept implemented in web browsers that restricts how documents or scripts loaded from one origin can interact with resources from another origin. An origin is defined by the combination of the protocol (e.g., HTTP or HTTPS), domain, and port of a URL. This policy is designed to prevent malicious actors from accessing sensitive data from another domain through methods like cross-origin requests. For instance, it ensures that a script loaded from one domain cannot read data from a different domain without explicit permission, often provided through mechanisms like Cross-Origin Resource Sharing (CORS).

143

Why is documentation important after an ethical hacking test

Reference answer

Documentation explains what was tested and what actually worked. It helps companies fix problems instead of guessing where risks exist.

144

What Is Security Misconfiguration Vulnerability?

Reference answer

Security misconfiguration occurs when systems have improper settings or default configurations. It exposes applications to attacks such as unauthorized access, data leaks, and privilege escalation. Penetration testers exploit misconfigurations to identify security gaps.

145

Describe a time when you encountered a well-defended system. How did you approach it?

Reference answer

I was testing a financial services company with robust network defenses—WAF, IDS/IPS, segmented networks, the full setup. Standard web application attacks weren't getting through. I shifted focus to the supply chain and discovered they had an older multifunction printer on the network that hadn't been patched in years. It was a classic overlooked asset. The printer had a web interface with default credentials still intact. I gained access to it, discovered it was storing copies of sensitive documents, and used it as a pivot point to access the internal network. From there, I was able to escalate privileges and move laterally. The client hadn't even considered the printer a security concern. The lesson for me was that sometimes the biggest vulnerabilities aren't in the flashy systems everyone is protecting—they're in the forgotten infrastructure. It's also why I always do thorough asset discovery before jumping into technical exploitation.

146

What is a network sniffer?

Reference answer

A network sniffer monitors the flow of data over computer network links. By allowing you to capture and view packet-level data on your network, the sniffer tool can help you identify network problems. Sniffers can be used both to steal information from a network and for legitimate network management.

147

What are the different types of hackers?

Reference answer

The types of hackers: Black Hat Hackers or Crackers: Illegally, they hack systems to gain unauthorized access and cause disruptions in operations or breach data privacy. White Hat Hackers or Ethical Hackers: These hackers hack systems and networks for the assessment of potential vulnerabilities or threats legally and with prior permission. Grey Box Hackers: They assess the security weakness of a computer system or network without the owner's permission but bring it to their attention later. Aside from these three types, there are also other types of miscellaneous hackers.

148

What is the importance of penetration testing in blockchain security?

Reference answer

Penetration testing is crucial in blockchain security, as it can help identify vulnerabilities in blockchain-based systems and smart contracts.

149

What is a Script Kiddie?

Reference answer

A Script Kiddie is someone who uses pre-built hacking tools and scripts without actually understanding how they work. They're not writing exploits, they're just running them. The term matters in professional security because it represents the risk from low-skill attackers using widely available tools. Many real-world breaches happen not from sophisticated attacks but from automated tools run by people who barely understand what they're doing.

150

What is a password cracker, and how does it work?

Reference answer

A password cracker is a tool that uses various techniques to crack passwords, often using dictionary, brute-force, and rainbow table attacks.

151

What is the practical difference between VA and PT — and when is each used?

Reference answer

Vulnerability Assessment (VA): Automated scanning to identify known vulnerabilities. Faster, cheaper, gives you a list of issues. Doesn't tell you how far an attacker could actually go. Penetration Testing (PT): Manual + automated testing where you actually attempt to exploit vulnerabilities. Slower, more expensive, but it shows real-world risk. Use VA for regular hygiene checks. Use PT when you need to understand the actual impact of a breach, before an attacker does.

152

How would you address a situation where you find that a company is using weak passwords across multiple accounts?

Reference answer

You safely demonstrate the risks of weak passwords without exposing real credentials. You explain how attackers could exploit them and suggest creating stronger passwords, enforcing multi-factor authentication, and educating employees about secure password practices. Additionally, you advise the client to implement regular password audits and monitoring to detect compromised or weak credentials over time.

153

What is information security?

Reference answer

Information security refers to the processes and methodologies designed to protect the confidentiality, integrity, and availability of information. It involves implementing measures to prevent unauthorized access, disclosure, disruption, modification, or destruction of information.

154

What is defense in depth?

Reference answer

Defense in depth is a multi-layered security approach where multiple defense mechanisms (firewalls, encryption, and intrusion detection systems) protect data at different levels. To crack a cybersecurity job, you must be ready for ethical hacker interview questions that cover topics like network security, penetration testing, and malware detection.

155

How do you use WHOIS lookup in reconnaissance?

Reference answer

Look for: Awareness of the importance of domain information. What to Expect: Explanation of how WHOIS can be used to gather domain registration details, such as owner information, contact details, and domain expiration dates.

156

What is the role of penetration testing in purple teaming exercises?

Reference answer

Penetration testing is an essential component of purple teaming exercises, which involve simulated attacks and defensive responses to improve incident response and threat detection.

157

What are the different phases involved in hacking a computer system?

Reference answer

The phases involved in hacking a computer system typically follow a structured sequence: - Reconnaissance – Gathering target information (e.g., network structure, IP addresses, software) using OSINT. - Scanning – Identifying live hosts, open ports, and services with tools like Nmap or Nessus. - Gaining Access – Exploiting vulnerabilities (weak passwords, unpatched software) to breach the system. - Maintaining Access – Installing backdoors or rootkits to ensure persistent access. - Privilege Escalation – Elevating user privileges to gain full control of the system. - Internal Reconnaissance – Exploring the system to gather data, discover additional vulnerabilities, or move laterally. - Covering Tracks – Deleting logs and obfuscating activities to avoid detection. - Exfiltration – Stealing and transferring sensitive data to the attacker's system. - Post-Exploitation – Using access to launch further attacks or maintain long-term control. These steps are iterative and may overlap, as attackers often refine their methods during the hacking process. Defensive measures like intrusion detection systems (IDS), encryption, and network segmentation help prevent or disrupt these phases.

158

What is buffer overflow?

Reference answer

Buffer overflow is an anomaly where a program, while writing data to a buffer, overruns the buffer's boundary and overwrites adjacent memory locations. Attackers can intentionally feed input that the buffer cannot store, and overwrite areas that hold executable code, replacing it with their own code, therefore executing arbitrary code on the target system. There are two main types of buffer overflows: stack based, more common and easier to perform and heap based, less common and harder to perform.

159

What is the difference between vulnerability and exploit?

Reference answer

A vulnerability is a weakness in a system, application, or network that can be exploited. An exploit is the code, technique, or tool used to take advantage of that vulnerability to perform unauthorized actions. The vulnerability is the flaw itself, while the exploit is the method to leverage it.

160

What is a denial-of-service (DoS) attack?

Reference answer

A denial-of-service (DoS) attack aims to disrupt or make a system unavailable to legitimate users. Attackers overwhelm the target system with traffic or requests, making it unable to respond to valid users.

161

Name some common types of cyberattacks.

Reference answer

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

162

How do you explain a firewall without sounding textbook

Reference answer

A firewall is basically a traffic controller. It rules about what may enter and which must be disparate, based on rules provided by the firm.

163

What is an Exploit in cybersecurity?

Reference answer

An Exploit is a method or technique used to take advantage of a vulnerability in a system or network. Once a vulnerability has been discovered, an attacker can develop an exploit to take advantage of it and gain unauthorized access to a system or perform other malicious actions. Exploits can take many forms such as software programs, scripts, or commands.

164

How would you approach testing an API for security vulnerabilities?

Reference answer

When testing an API, the approach begins with reviewing the API documentation to understand its functionality and endpoints. Common vulnerabilities are tested for, including authentication issues, lack of rate limiting, and injection attacks. Improper authorization, such as broken object-level authorization (BOLA), is also examined. Tools like Postman or Burp Suite assist in crafting requests and fuzzing parameters. Focus areas include identifying sensitive data exposure, improper error handling, and injection flaws like SQL injection (SQLi) or XML External Entity (XXE) attacks.

165

What is OWASP, and what are examples of its top 10 web vulnerabilities?

Reference answer

OWASP (Open Web Application Security Project) is a non-profit organization that improves software security by providing resources, tools, and best practices. It is well-known for its OWASP Top 10, a list of the prominent web application security risks. Here are the examples of OWASP top 10 web vulnerabilities: - Injection – Attackers inject malicious code into inputs (e.g., SQL injection) to manipulate databases or commands. - Broken Authentication – Weak authentication mechanisms that allow attackers to impersonate users. - Sensitive Data Exposure – Inadequate protection of sensitive data like passwords or financial information. - XML External Entities (XXE) – Vulnerabilities in XML parsers that allow attackers to access internal systems. - Broken Access Control – Inadequate restrictions on user permissions, allowing unauthorized actions. - Security Misconfiguration – Poorly configured security settings or defaults, such as open ports or unnecessary services. - Cross-Site Scripting (XSS) – Attackers inject malicious scripts into web pages to execute in users' browsers. - Insecure Deserialization – Exploiting insecure deserialization of data to execute malicious code. - Using Components with Known Vulnerabilities – Leveraging outdated software components with known security flaws. - Insufficient Logging & Monitoring – Lack of effective logging and monitoring to detect and respond to attacks. OWASP provides guidelines and tools to help organizations mitigate these risks and enhance their web application security.

166

What are SUID and sudo?

Reference answer

SUID (Set User ID) allows a file to execute with the permissions of its owner, enabling privilege escalation. Sudo allows authorized users to execute commands as another user, typically root, with controlled permissions.

167

What is penetration testing?

Reference answer

Penetration testing simulates real-world cyberattacks to identify and fix system vulnerabilities before malicious hackers can exploit them.

168

What is XML entity injection, and how does it function?

Reference answer

XML Entity Injection (XXE) is a security vulnerability in XML parsers that occurs when an attacker is able to inject malicious XML code into an XML document, causing the parser to process it in unintended ways. This can lead to the exposure of sensitive data, denial of service, and even remote code execution. Here's how it functions: Step 1: External Entity Declaration – The attacker defines an external entity within the XML, which can be a reference to a local file or a malicious server. Step 2: Injection – The malicious entity is injected into the XML request, often within user-controlled data. Step 3: Parsing – When the XML document is parsed, the XML processor fetches the external entity and processes it. Step 4: Exploitation – This can lead to attacks such as: - Reading sensitive files on the server (e.g., /etc/passwd). - Sending the contents of sensitive files to an external server controlled by the attacker. - Triggering denial of service by using recursive entity references. To prevent XXE, disable external entity processing in XML parsers, use secure libraries, and validate input carefully.

169

What is a hash collision?

Reference answer

A hash collision occurs when two different inputs produce the same hash value in a hashing algorithm. This undermines the uniqueness and integrity of the hash function, potentially leading to security vulnerabilities, especially in cryptographic applications.

170

How would you allow regular users to run bash scripts as root and which way is most secure?

Reference answer

The best way would be to use cron jobs, as long as the user does not have access to modify the script that is being run, alternatively a SUDO rule can be added to allow the user to run the script as sudo.

171

What are some common social engineering techniques?

Reference answer

Common social engineering techniques include: - Phishing: Sending fraudulent emails or messages that appear legitimate to trick victims into revealing sensitive information. - Pretexting: Creating a believable scenario to gain access to information or systems by impersonating someone with authority. - Baiting: Offering enticing items or rewards to lure victims into a trap. - Tailgating: Following someone authorized to enter a secure area without authorization.

172

What is the difference between TCP and UDP?

Reference answer

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are both communication protocols used for transmitting data over networks, but they differ significantly in functionality and use cases. TCP is a connection-oriented protocol that ensures reliable data transfer. It establishes a connection between the sender and receiver before data transmission begins and guarantees that data packets arrive in the correct order. This reliability, however, comes at the cost of speed, as TCP includes error-checking mechanisms and retransmissions in case of data loss. It is ideal for scenarios where accuracy and completeness are critical, such as file transfers, emails, and web browsing. UDP, on the other hand, is a connectionless protocol that prioritizes speed over reliability. It does not establish a connection before sending data and does not guarantee the delivery or order of packets. This makes UDP faster but less reliable than TCP. It is commonly used in applications where real-time performance is crucial, such as online gaming, video streaming, and voice calls, where occasional data loss is acceptable. The choice between TCP and UDP depends on the specific requirements of the application, balancing speed, reliability, and efficiency.

173

What is social engineering in penetration testing?

Reference answer

Social engineering involves manipulating individuals into revealing sensitive information or performing actions that compromise security.

174

What Is SSHExec in Penetration Testing?

Reference answer

SSHExec is a command-line tool used for remote command execution over SSH connections. It allows penetration testers to run scripts and commands on remote systems. It is commonly used for automating tasks, managing systems, and executing payloads.

175

What are some common security best practices for individuals?

Reference answer

Common best practices include: - Using strong, unique passwords and a password manager. - Enabling multi-factor authentication (MFA). - Keeping software and systems updated. - Being cautious of phishing attempts. - Using a VPN on public Wi-Fi. - Regularly backing up important data. - Installing and maintaining antivirus software.

176

What is ethical hacking, and how does it differ from malicious hacking?

Reference answer

Ethical hacking is basically doing what a malicious hacker does, but with full permission from the organization. You're finding weaknesses before the bad guys do. The key difference isn't the technique; it's the authorization. A malicious hacker breaks in without permission. An ethical hacker has a signed agreement before touching anything.

177

What Are Incognito Attacks with Meterpreter?

Reference answer

An Incognito attack uses Meterpreter to bypass authentication by impersonating user tokens. It allows attackers to escalate privileges and perform actions as another user without detection. Penetration testers use this technique to simulate stealthy privilege escalation attacks.

178

What is Server-Side Request Forgery (SSRF) vulnerability?

Reference answer

Server-Side Request Forgery (SSRF) is a security vulnerability that allows an attacker to force a server to make unauthorized requests to external or internal resources. This often occurs when user input is not properly validated before being used to fetch remote resources. SSRF can be exploited to access internal systems, retrieve sensitive data, perform port scanning, or even execute arbitrary commands on the server. To mitigate SSRF vulnerabilities, developers should: - Validate and sanitize user inputs. - Restrict allowed outbound requests to a whitelist of trusted destinations. - Disable unnecessary network access from the server. - Utilize appropriate network segmentation to limit access to sensitive resources.

179

What Are Cryptographic Failures in Penetration Testing?

Reference answer

Cryptographic failures occur when weak or flawed encryption algorithms expose sensitive data. It leads to data leakage, unauthorized access, or message tampering. Penetration testers analyze cryptographic flaws to assess the effectiveness of data protection measures.

180

What tool would you use to perform a port scan?

Reference answer

The most popular tool to perform port scans is Nmap. Port scans can also be done through scripting, for example using Python.

181

What are SSL sessions and SSL connections, respectively?

Reference answer

A secure Socket Layer is a temporary peer-to-peer communications channel connecting each connection to a single SSL Session. An SSL session is a relationship between a client and a server typically established through the handshake protocol. Multiple SSL connections can share a defined set of parameters.

182

What is a Buffer Overflow, and how would you exploit it?

Reference answer

A buffer overflow happens when a program tries to store more data in a buffer than it's designed to handle, causing the extra data to spill over into nearby memory. To exploit it, vulnerable software or functions are identified using fuzzing techniques or tools like AFL (American Fuzzy Lop). A malicious payload is crafted to overwrite the return address, redirecting execution to shellcode for system control. In modern systems, bypassing defenses like DEP and ASLR is necessary, using techniques like Return-Oriented Programming (ROP).

183

What is "quantum computing security"?

Reference answer

Quantum computing security is a field that investigates the impact of quantum computing on existing cybersecurity measures, particularly cryptography. It explores the potential threats posed by quantum computers to current encryption algorithms and develops new, quantum-resistant encryption techniques.

184

Walk me through how you'd test for SQL injection vulnerabilities in a web application.

Reference answer

First, I map out all user inputs—form fields, URL parameters, cookies, headers, anything that might reach the database. In Burp Suite, I'll test each one with basic syntax like a single quote to see if it causes an error. If it does, that's often a good indicator. Then I test more systematically. I'll try UNION-based injection first because it's usually fastest if it works. I'll enter something like ' UNION SELECT NULL, NULL, NULL-- - and increase the number of NULLs until the query errors go away, which tells me how many columns are in the original query. Once I know that, I can extract data. If UNION injection doesn't work, I move to boolean-based blind injection—testing whether ' AND 1=1 behaves differently than ' AND 1=2. If the application responds differently, I'm injecting. From there, I can extract data character by character. I always test with a WAF bypass in mind too—sometimes simple encoding or comment syntax changes bypass basic protections. The key is understanding that SQL injection is about breaking out of the intended query context and making the database execute your commands.

185

What is the difference between IDS and IPS?

Reference answer

An IDS detects and alerts on threats, while an IPS detects and blocks threats in real-time.

186

What is a buffer overflow?

Reference answer

A buffer overflow occurs when a program tries to write more data into a memory buffer than it can hold. This can overwrite adjacent memory locations, potentially corrupting program data or executing malicious code.

187

Mention the different types of password-cracking techniques in Ethical Hacking.

Reference answer

- Brute force attack: This technique involves trying every possible combination of characters until the correct password is found. It is very time-consuming and is often used as a last resort. - Hybrid attack: This technique combines elements of both dictionary and brute force attacks. It uses a dictionary of common words and phrases, but also includes variations on those words (e.g., adding numbers or special characters). - Syllable attack: This technique involves breaking the password down into syllables and trying all possible combinations of those syllables. - Rule-based attack: This technique involves using a set of rules to create and try different password combinations. For example, the rule "add a number to the end of every word in the dictionary" could be used to create and try new passwords.

188

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.

189

Explain to me what a sniffing attack is.

Reference answer

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

190

Describe a situation where you were able to use persuasion to successfully convince someone to see things your way.

Reference answer

Additional behavioral questions include: - Your initial penetration test proposal is heavily criticized by your manager. How have you adapted to negative feedback in the past? - Describe a situation where you were able to use persuasion to successfully convince someone to see things your way. - Can you think of a situation where innovation was required at work? What did you do in this situation?

191

How Do You Communicate Findings to Non-Technical Stakeholders?

Reference answer

Communication skills are vital for a penetration tester. Candidates should describe how they simplify technical jargon, use visual aids, and focus on the business impact of findings to effectively communicate with non-technical stakeholders.

192

What is a cross-site request forgery (CSRF) attack, and how can it be prevented?

Reference answer

A CSRF attack is a type of attack where an attacker tricks a user into performing unintended actions on a web application. It can be prevented by using token-based authentication, validating user input, and implementing same-origin policies.

193

Tell me about a time you had to explain a technical vulnerability to someone without a technical background.

Reference answer

A client's board was getting a security update, and I had to present findings on Cross-Site Scripting vulnerabilities. Most board members were non-technical. Instead of talking about DOM manipulation and JavaScript execution, I showed them a video where I entered code into a comment field, and it stole another user's session cookie. They could see exactly what an attacker could do. I explained: 'Imagine if someone could forge your signature on an email and send it from your account. That's what this vulnerability allows.' I also connected it to their business: 'Your customers share sensitive information in these comment sections. This vulnerability could let a hacker see that data.' The presentation led to immediate prioritization of the fixes. It taught me that showing, not just telling, makes a huge difference.

194

What is a buffer overflow, and how can it be prevented?

Reference answer

A buffer overflow is a type of attack where an attacker injects malicious code into a program's buffer. It can be prevented by implementing secure coding practices, using address space layout randomization, and enabling data execution prevention.

195

How Does Nmap Work Internally?

Reference answer

Strong answer includes methodology: Nmap sends crafted packets to target ports and analyzes responses to determine open ports, closed ports, filtered ports, running services, and OS fingerprints. Mention techniques like SYN scanning, TCP connect scanning, UDP scanning, version detection, and script scanning (NSE). Bonus depth: Explain how SYN scans are "half-open" and stealthier than full TCP connects.

196

Describe a scenario where DNS enumeration can be useful.

Reference answer

Look for: Familiarity with tools like DNSRecon or Fierce. What to Expect: Discussion on gathering information about subdomains, IP addresses, and email servers to identify entry points for attacks.

197

How should risk be prioritized in a penetration testing report?

Reference answer

Risk should be prioritized based on the likelihood and impact of a vulnerability being exploited, with high-risk findings receiving higher priority.

198

In what format are Windows and Linux hashes stored

Reference answer

Windows stores hashes in NTLM or LM format, while Linux stores hashes in formats like MD5, SHA-256, or SHA-512 (e.g., in /etc/shadow).

199

Difference between symmetric and asymmetric encryption

Reference answer

Symmetric encryption only uses one key for encryption as well as decryption. Asymmetric Encryption two keys, one to encrypt the information and one to decrypt it. These keys are called Public Key and Private Key.

200

How would you set up a firewall?

Reference answer

These are the steps I would follow to set up a firewall: 1. For the username and password: We'll need to change the default password for a firewall device. 2. For remote administration: We'll need to disable this feature. 3. For port forwarding: We'll have to configure the correct port forwarding to ensure that applications, like a web server or an FTP server, work properly. 4. We'll need to ensure that the network's DHCP server is disabled before installing the firewall. Otherwise, it will cause a conflict. 5. We'll need to make sure that logging is enabled so that we can troubleshoot any firewall issues or possible attacks. 6. In terms of policies, we should have clear security policies. The firewall should enforce those policies.

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