Certified Ethical Hacker V12 Interview Questions Answers 2026

Certified Ethical Hacker (CEH V12) Training Intermediate-Level Questions

1. What is Ethical Hacking?

Ethical hacking involves legally breaking into computers and devices to test an organization's defenses. It's also known as penetration testing or white-hat hacking, where the hacker has permission to probe for vulnerabilities.

2. What is the primary goal of an ethical hacker?

The primary goal is to identify and fix vulnerabilities within a system before malicious hackers can exploit them, ensuring the system's security and integrity.

3. Can you name some common types of cyberattacks?

Phishing, SQL Injection, Cross-Site Scripting (XSS), Denial of Service (DoS)/Distributed Denial of Service (DDoS) attacks, and Man-in-the-Middle (MitM) attacks are common cyber threats.

4. What is a VPN, and why is it important for security?

A Virtual Private Network (VPN) extends a private network across a public network, enabling users to send and receive data as if their computing devices were directly connected to the private network. It's crucial for enhancing online privacy and protecting sensitive data.

5. What are the phases of ethical hacking?

The five phases include Reconnaissance, Scanning, Gaining Access, Maintaining Access, and Covering Tracks.

6. What is social engineering? Give an example.

Social engineering is a manipulation technique that exploits human error to gain private information, access, or valuables. Phishing emails that trick users into revealing passwords are a common example.

7. Explain the difference between IDS and IPS.

An Intrusion Detection System (IDS) monitors network traffic for suspicious activity and issues alerts when such activity is detected, whereas an Intrusion Prevention System (IPS) actively blocks potentially harmful activity.

8. What is a firewall?

A firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization’s previously established security policies.

9. Describe what 'footprinting' is in ethical hacking.

Footprinting is the first phase of ethical hacking, where the hacker collects as much information as possible about the target system, including domain names, IP addresses, and network information.

10. What is the difference between encryption and hashing?

Encryption is a reversible process used to transform data into a secure format for transmission, which can then be reversed into its original format. Hashing, however, is a one-way function that converts data into a fixed-size string of characters, which is not meant to be reversed.

11. What are honeypots?

Honeypots are decoy systems or servers designed to lure hackers away from the actual network resources and study their techniques.

12. What is SQL Injection?

SQL Injection is a code injection technique that exploits a security vulnerability occurring in the database layer of an application. It allows attackers to execute malicious SQL statements that control a web application’s database server.

13. Explain Cross-Site Scripting (XSS).

XSS is a vulnerability that allows attackers to inject malicious scripts into content from otherwise trusted websites, potentially compromising the confidentiality, integrity, and availability of the data.

14. What is a Denial of Service (DoS) attack?

A DoS attack aims to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to the Internet.

15. What are the key differences between symmetric and asymmetric encryption?

Symmetric encryption uses the same key for encryption and decryption, making it faster but less secure for certain applications. Asymmetric encryption uses a pair of public and private keys, enhancing security but being slower in comparison.

16. What does 'penetration testing' involve?

Penetration testing involves simulating cyberattacks against your computer system to check for exploitable vulnerabilities, in terms of security holes, weaknesses, or software bugs.

17. What is a 'false positive' in the context of security?

A false positive occurs when a security system or software mistakenly identifies a legitimate action as malicious, potentially leading to unnecessary or incorrect actions.

18. What are digital certificates?

Digital certificates are electronic "passwords" that allow individuals and organizations to engage in secure communication over the internet, verifying the party's identity with whom they are communicating.

19. What is a 'session hijacking' attack?

Session hijacking, also known as token hijacking, involves the exploitation of a valid computer session—sometimes also called a session key—to gain unauthorized access to information or services in a computer system.

20. What is the difference between active and passive reconnaissance?

Active reconnaissance involves directly interacting with the target to gather information (e.g., scanning ports). In contrast, passive reconnaissance involves collecting information without directly interacting with the target, such as through public records or social media.

Certified Ethical Hacker (CEH V12) Training Advance-Level Questions

1. What are the steps involved in a penetration testing process?
   • The penetration testing process generally follows five main phases: Planning, where goals and the scope of the test are defined, and intelligence gathering on the target is conducted. Scanning, which involves understanding how the target application will respond to various intrusion attempts. Gaining Access, where the tester exploits vulnerabilities to enter the system and potentially escalate privileges. Maintaining access, which involves securing a presence in the exploited system to gather as much data as possible. Finally, Analysis, where the results of the penetration test are compiled into a report detailing vulnerabilities, the data accessed, and the time the tester was able to remain in the system undetected.
2. Describe an experience where you identified and exploited a zero-day vulnerability.
   • When addressing zero-day vulnerabilities, the process includes rigorous testing and validation in a controlled environment to minimize potential harm. For example, upon discovering a zero-day in a popular web application framework, the initial step involved recreating the exploit in a lab setting to understand the vulnerability's mechanics without affecting real-world systems. After confirming the vulnerability, it was essential to develop a patch or recommend mitigation steps. The information was then communicated responsibly to the software vendor to prepare a security patch before details were disclosed publicly to prevent exploitation.
3. How do you stay updated with current cybersecurity threats and vulnerabilities?
   • Staying updated requires a disciplined approach to continuous learning and information gathering. This involves subscribing to major cybersecurity publications, participating in hacker forums, and attending conferences. Engaging with other cybersecurity professionals through community groups and professional networks is also crucial. Using threat intelligence platforms that provide real-time data about emerging threats can help in proactively defending systems against new types of attacks.
4. Can you explain the importance of ethical hacking in blockchain technology?
   • In blockchain technology, ethical hacking plays a vital role in ensuring the security and integrity of the ledger. Since blockchains often involve significant financial assets and sensitive data, identifying vulnerabilities before they can be exploited by malicious actors is crucial. Ethical hackers test smart contracts, consensus protocols, and node security to prevent unauthorized access and potential theft of cryptocurrency or data manipulation.
5. What methodologies do you use to test the security of mobile applications?
   • Testing the security of mobile applications involves several methodologies, including static application security testing (SAST) and dynamic application security testing (DAST). Additionally, using mobile-specific security testing tools that can simulate attacks on both Android and iOS platforms is crucial. The process often includes testing for insecure data storage, improper session handling, and vulnerabilities specific to mobile environments like side-channel attacks.
6. Discuss a complex cyberattack you've analyzed and how you resolved the issues.
   • Analyzing a complex cyberattack, such as an advanced persistent threat (APT) involving multiple stages, requires a deep dive into forensic analysis and threat hunting. For instance, resolving an issue where attackers had gained long-term access to a network would involve identifying and isolating affected systems, eradicating the attackers' tools, fortifying network defenses, and conducting a thorough review of network access controls. Continuous monitoring and additional training for the in-house security team would also be part of the resolution to prevent future incidents.
7. What are some common pitfalls in network security, and how can they be avoided?
   • Common pitfalls in network security include weak authentication mechanisms, inadequate encryption, and poorly configured firewalls. These can be avoided by implementing multi-factor authentication, using robust encryption protocols for data transmission, and ensuring that firewalls are configured to block unnecessary ports and services. Regular audits and adherence to security best practices and standards are also essential to maintain a secure network environment.
8. How would you handle a situation where an organization is reluctant to implement necessary security measures?
   • Handling reluctance in implementing security measures involves educating stakeholders about the potential risks and consequences of inadequate security practices. Demonstrating the financial and reputational impacts through case studies or past incidents can be effective. Offering phased implementation strategies and showing quick wins to build confidence can also help in gradually addressing their concerns.
9. Can you describe the role of artificial intelligence in cybersecurity?
   • Artificial intelligence (AI) plays a crucial role in enhancing cybersecurity through automated threat detection systems and behavior analytics. AI algorithms can analyze vast amounts of data to identify patterns indicative of malicious activities that might elude human analysts. AI is also used in developing predictive capabilities that anticipate attack vectors and vulnerabilities based on trending data and past incidents.
10. What ethical considerations should be taken into account during a penetration test?
    • Ethical considerations in penetration testing include obtaining explicit written permission before conducting tests, respecting the privacy and data integrity of the organization, and maintaining confidentiality about vulnerabilities discovered. It is also crucial to ensure that the penetration testing activities do not impact the organization's operations or data availability to its users.