Get All Network Defense Essentials Exam Questions with Validated Answers
| Vendor: | Eccouncil |
|---|---|
| Exam Code: | 112-51 |
| Exam Name: | Network Defense Essentials Exam |
| Exam Questions: | 75 |
| Last Updated: | October 6, 2026 |
| Related Certifications: | Network Defense Essentials |
| Exam Tags: |
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George, a professional hacker, targeted a bank employee and tried to crack his password while he was attempting to log on to the remote server to perform his regular banking operations. In this process, George used sniffing tools to capture the password pairwise master key (PMK) associated with the handshake authentication process. Then, using the PMK, he gained unauthorized access to the server to perform malicious activities.
Identify the encryption technology on which George performed password cracking.
WPA2 (Wi-Fi Protected Access 2) is an encryption technology that secures wireless networks using the IEEE 802.11i standard. WPA2 uses a four-way handshake to authenticate the client and the access point, and to generate a pairwise transient key (PTK) for encrypting the data. The PTK is derived from the password pairwise master key (PMK), which is a shared secret between the client and the access point. The PMK can be obtained either by using a pre-shared key (PSK) or by using an 802.1X authentication server. In the above scenario, George performed password cracking on WPA2, as he used sniffing tools to capture the PMK associated with the handshake authentication process. Then, using the PMK, he was able to derive the PTK and decrypt the data exchanged between the client and the access point. Reference:
How WPA2-PSK encryption works? - Cryptography Stack Exchange
WPA2 Encryption and Configuration Guide - Cisco Meraki Documentation
Bob, a security professional, was recruited by an organization to ensure that application services are being delivered as expected without any delay. To achieve this, Bob decided to maintain different backup servers for the same resources so that if one backup system fails, another will serve the purpose.
Identify the IA principle employed by Bob in the above scenario.
Identify the UBA tool that collects user activity details from multiple sources and uses artificial intelligence and machine learning algorithms to perform user behavior analysis to prevent and detect various threats before the fraud is perpetrated.
Identify the technique through which mobile application marketers utilize the user's location to gather sensitive data and know about users' offline activities from the location data.
Johana was working on a confidential project on her laptop. After working for long hours, she wanted to have a coffee break. Johana left the system active with the project file open and went for a coffee break. Soon after Johana left the place, Bob accessed Johana's system and modified the project file.
Which of the following security guidelines did Johana fail to comply with?
One of the most basic and important security guidelines for laptop users is to always log off or lock the system when unattended. This prevents unauthorized access to the system and the data stored on it by anyone who might have physical access to the laptop. Logging off or locking the system requires a password or other authentication method to resume the session, which adds a layer of protection to the laptop. Johana failed to comply with this security guideline, as she left the system active with the project file open and went for a coffee break, allowing Bob to access her system and modify the project file. Reference:
Ten simple steps for keeping your laptop secure - Step 1: Require a password when logging in
6 Steps to Practice Strong Laptop Security - Step #1: Set complex passwords where it counts
A Practical Guide to Securing Your Windows PC - Section: Lock your computer when you step away
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