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Top 20 Certified Ethical Hacker Interview Questions and Answer

The technique of discovering vulnerabilities in a software, website, or agency’s structure that a hacker might exploit is known as ethical hacking. They employ this method to avoid cyberattacks and security breaches by legitimately hacking into systems and looking for flaws. CEH was designed to include a hands-on environment and a logical procedure across each ethical hacking area and technique. This is to provide you the opportunity to work towards proving the knowledge and skills to earn the CEH certificate and perform the tasks of an ethical hacker.

Top 20 Certified Ethical Hacker Interview Questions and Answer

Certified Ethical Hackers can now be found working with some of the greatest and wealthiest industries such as healthcare, education, government, manufacturing, and many others. Due to the sheer demand, CEH certified Ethical Hacker is a lucrative and rewarding career choice currently and this potential is only going to increase in the future. Hence, to make the process easier for CEH certification enthusiasts and job seekers, here are the top 20 Interview questions that a CEH certified Ethical Hacker may face:

Interview Questions
1. Describe hacking?
Hacking is the act of gaining access to a system or network without authorization. A hacker is someone who engages in this activity. They use computers for malevolent purposes such as invasion of privacy, theft of corporate and individual data, and more.

2. Explain ethical hacking?
When someone performs penetration testing or intrusion testing on behalf of the owner of a software system, program, network, or other computing resources, they are considered to be ethical hackers because they are looking for loopholes and vulnerabilities that a malevolent hacker could use.

3. What are the different categories of hackers?
There are three categories of hackers, each with a different goal and legality of the action.

Black Hat: The black hat hackers are responsible for creating malware. They obtain unauthorized access to data or network, causing it to be damaged and stealing critical data.

White Hat: These are known as ethical hackers. They are widely used by organizations or government bodies to identify weaknesses.

Grey Hat: The grey hat hacker is the combination of both black and white hats, they find the weakness of the network or device without the permission or knowledge of the owner. Their objective is to bring the system’s vulnerabilities to the customer’s attention and seek compensation or an enticement from the owner.

Besides these well-known hackers, there are a variety of hackers based on what they hack and how they hack:

Hacktivist: A person who uses technology to spread social, religious, or political messages. Website defacement or Denial-of-Service assaults are common examples of hacktivism.

Script Kiddie: The person who accesses a computer system using automation tools written by others and has little understanding of the fundamental concept, known as Script Kiddie.

Elite Hackers: This is a term used among hackers to describe the most proficient hackers.

Neophyte: They’re also known as green hat hackers or beginner hackers because they have no prior experience with technology or hacking.

Blue Hat: Those who are not affiliated with computer security consulting firms seek to do a bug test on a system before its release to identify flaws and plug gaps.

Red Hat:  They are a hybrid of both white hat and black hat hackers, and are typically engaged by top intelligence services, government entities, and other firms that handle sensitive data.

4. Explain different types of hacking?
Hacking is classified into the following types, based on the category of being hacked:

  1. Website hacking: It refers to unlawful access to a web server and its connected software, such as databases and interfaces, as well as the alteration of data.
  2. Network hacking: It refers to collecting network data using tools such as Telnet, ping, and so on, with the goal of serious harm to the network and disturbing its functions.
  3. Email hacking: Email hacking means accessing customers’ email accounts and utilizing them without permission.
  4. Password hacking: It is a process of recovering secret passwords from data stored on multiple platforms.
  5. Computer hacking: Using hacking tactics, refers to gaining illegal access to a computer and stealing data such as a computer login and Information.

5. What kind of tools are used in ethical hacking?
Following are the most common ethical hacking tools:

  • John and Ripper
  • Metasploit
  • Nmap
  • Acunetix
  • Wireshark
  • SQLMap
  • OpenVAS
  • IronWASP
  • Nikto
  • Netsparker

6. Explain various stages of hacking?
Hacking is divided into five stages:

  1. Reconnaissance: This is the primary stage of hacking, also known as the information gathering and footprinting phase. In this stage, hackers collect as much as information about the target. It includes network, host, DNS records, and more.
  2. Scanning: It examines the network using the data collected during reconnaissance.
  3. Achieving access: The stage in which attackers use various tools and tactics to gain access to a system or network.
  4. Keeping access open: Once attackers have gained access, they want to keep it for further attacks and operations. This can be accomplished through the use of malware, spyware, and other malicious software.
  5. Covering tracks: Once the attackers have gained and maintained access, they hide their traces to prevent identification. It includes changing/deleting/corrupting the value of logs, erasing all evidence of work, uninstalling software, deleting files, and other tasks.

7.What is the distinction between hashing and encryption?

Hashing Encryption
  • Hashing is a technique for verifying the content’s authenticity
  • Hashing is a one-way function that converts plain text into an unchangeable unique sequence
  • Whereas encryption ensures data privacy and security
  • Encryption is a two-way process that encrypts and decrypts information

8. What exactly do you understand when you say “keystroke logging”?
Keystroke logging (sometimes called keylogging or keyboard capturing) is a technique for recording keystrokes. It’s a form of monitoring software that records every input on the keyboard. Every keystroke is recorded, and data is accessed by using the logging program.

9. What exactly do you mean by Trojan and how do you classify them?
A Trojan is a sort of malware that is frequently created by hackers or attackers to obtain access to target computers. Users are tricked by some appealing social media advertisements and then led to fake links, where Trojans are loaded and run on their devices.

Types of Trojan:

Trojan downloader: It is a virus that downloads and installs other viruses.

Ransomware: This type of malware encrypts the data on your device/system.

Trojan-droppers: These are advanced programs that attackers utilize to install malware. Because most antivirus products do not detect droppers as dangerous, they are used to install malware.

Trojan banker: These cybercriminals collect user account information such as credit card numbers and online banking passwords.

Trojan-backdoor: It is the most common sort of Trojan, and it builds a backdoor that allows attackers to gain access to the machine, later from a remote location using a Remote Access Tool (RAT). This Trojan gives you complete control over your computer.

10. What exactly do you mean by “exploitation”?
Exploitation is a feature of pre-programmed software or scripts that enable attackers to obtain control of the specified system/network and attack its vulnerabilities. To detect these vulnerabilities, most hackers utilize scanners such as OpenVAS, Nessus, and others.

11. What exactly is enumeration in the context of ethical hacking?
The first phase of ethical hacking is enumeration, which is information collection. During this phase, the attacker establishes an active connection with the target and attempts to gather as much data as possible to identify system vulnerabilities or weaknesses and further take advantage of the system. Enumeration gathers information on the following topics:

  • Password policies list
  • IP tables
  • Network share
  • Username of different system
  • SNMP data

12. Describe MIB?
The Management Information Base (MIB) is a collection of network components that are accessed remotely. It comprises all of the technical specifications of the network objects that a network management system is observing. The MIB database object serves as a point of reference for a comprehensive set of management data on a network system.

13. What is footprinting?
Footprinting is a methodology for gathering as much information about the specified infrastructure as possible in order to carry out a successful cyber operation. It also determines the user’s defense capabilities. A hacker can gather information about a domain name, IP address, namespace, employee information, contact information, mails, and employee data during this period. It is divided into two parts:

Active footprinting: It collects data by direct contact through the target network.

Passive footprinting: It gathers data from a target network that is located far away from the attacker.

14. What exactly is DNS(Domain Name System) Cache Poisoning?
DNS cache poisoning is a method of diverting internet traffic away from real servers and towards misleading ones by exploiting DNS flaws. DNS spoofing is another term for it.

15. What exactly is a DDoS assault, and how does it perform?
Distributed Denial of Service(DDoS) is a type of attack, where numerous affected systems are frequently infected with a virus and leveraged to target a single system, resulting in a DoS (Denial of Service) attack.

It is an attempt to keep a webpage or online service unavailable by flooding it with massive amounts of traffic from several sources.

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16. What exactly is a phishing attack?
Phishing is a process or an attempt to get sensitive information such as user data, credit card numbers, and so on. These attacks usually happen while using personal emails or social media sites, as well as online purchases and other services.

17. What are the different types of attacks?
Following are the different types of attacks:

  • Vishing
  • Phishing
  • Tailgating
  • Pretexting
  • Quid pro quo
  • Baiting
  • Spear phishing

18. Explain a rogue DHCP server?
It is a DHCP server that is installed on a network or system by an attacker, which did not come under the supervision of system/network administrators. It could be a modem or router.

Attackers mainly deploy rogue DHCP servers for network attacks such as reconnaissance, sniffing, and man-in-the-middle assaults.

19. Describe ARP poisoning?
It is also known as ARP routing or ARP spoofing. It is a method of attack where attackers change the MAC(Media Access Control) address and target the ethernet LAN network by modifying the target computer’s ARP cache with faked requests and reply packets.

20. What do you mean by fingerprinting?
Fingerprinting is a method to determine which operating system is installed on a remote device.

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My name is Pooja Rawat. I have done my B.tech in Instrumentation engineering. My hobbies are reading novels and gardening. I like to learn new things and challenges. Currently I am working as a Cyber security Research analyst in Infosectrain.