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Eccouncil 112-51 Exam Questions
- Topic 1: Network Security Fundamentals: This component assesses an IT professional's knowledge of the principles behind network security, as well as the dangers and weaknesses connected to networks. This section aims to provide network engineers and security experts with an understanding of the various network security protocols, their purposes, and the ways in which they contribute to the overall security of the network.
- Topic 2: Identification, Authentication, and Authorization: This part addresses the basic concepts, jargon, and models associated with identifying, authenticating, and authorizing users and systems in a network environment. It is intended for security administrators and access control managers.
- Topic 3: Identity and Access Management (IAM) Concepts: An overview of IAM concepts, components, and their function in network resource security is given in this section for security architects and IAM administrators.
- Topic 4: Administrative Controls for Network Security: This section gives an overview of IAM ideas, components, and its function in network resource security for security architects and IAM administrators.
- Topic 5: Administrative Controls for Network Security: This section addresses the creation and application of security policies, standards, processes, and recommendations for compliance officers and security policy makers to safeguard network assets. It also entails being aware of the legal and regulatory frameworks around network security.
- Topic 6: Physical Controls for Network Security: This section highlights the significance of physical security measures for safeguarding network infrastructure and data, especially for physical security workers and building managers. It addresses several physical security measures and how to apply them.
- Topic 7: Technical Controls for Network Security: This section is intended for network engineers and security architects and focuses on technical safeguards for network systems and data.
Free Eccouncil 112-51 Exam Actual Questions
Note: Premium Questions for 112-51 were last updated On Sep. 04, 2026 (see below)
Amber is working as a team lead in an organization. She was instructed to share a policy document with all the employees working from remote locations and collect them after filling. She shared the files from her mobile device to the concerned employees through the public Internet. An unauthorized user accessed the file in transit, modified the file, and forwarded it to the remote employees.
Based on the above scenario, identify the security risk associated with mobile usage policies.
Sharing confidential data on an unsecured network is a security risk associated with mobile usage policies. Mobile devices are often used to access and transmit sensitive information over public or untrusted networks, such as WiFi hotspots, cellular networks, or Bluetooth connections. This exposes the data to interception, modification, or redirection by malicious actors who may exploit mobile security vulnerabilities or use network-based attacks, such as man-in-the-middle, spoofing, or sniffing. To prevent this risk, mobile users should follow best practices such as using encryption, VPN, certificate pinning, and secure protocols to protect the data in transit. They should also avoid sending or receiving sensitive data over unsecured networks or applications, and verify the identity and integrity of the endpoint servers before establishing a connection. Reference:
The 9 Most Common Security Threats to Mobile Devices in 2021, Auth0, June 25, 2021
7 Mobile App Security Risks and How to Mitigate Them, Cypress Data Defense, July 10, 2020
The Latest Mobile Security Threats and How to Prevent Them, Security Intelligence, February 19, 2019
George, a certified security professional, was hired by an organization to ensure that the server accurately responds to customer requests. In this process, George employed a security solution to monitor the network traffic toward the server. While monitoring the traffic, he identified attack signatures such as SYN flood and ping of death attempts on the server.
Which of the following categories of suspicious traffic signature has George identified in the above scenario?
Denial-of-service (DoS) is the category of suspicious traffic signature that George identified in the above scenario. DoS signatures are designed to detect attempts to disrupt or degrade the availability or performance of a system or network by overwhelming it with excessive or malformed traffic. SYN flood and ping of death are examples of DoS attacks that exploit the TCP/IP protocol to consume the resources or crash the target server. A SYN flood attack sends a large number of TCP SYN packets to the target server, without completing the three-way handshake, thus creating a backlog of half-open connections that exhaust the server's memory or bandwidth. A ping of death attack sends a malformed ICMP echo request packet that exceeds the maximum size allowed by the IP protocol, thus causing the target server to crash or reboot. DoS attacks can cause serious damage to the organization's reputation, productivity, and revenue, and should be detected and mitigated as soon as possible123. Reference:
Network Defense Essentials Courseware, EC-Council, 2020, pp. 3-33 to 3-34
What is a denial-of-service attack?, Cloudflare, 2020
Denial-of-service attack - Wikipedia, Wikipedia, March 16, 2021
Kevin, a security team member, was instructed to share a policy document with the employees. As it was supposed to be shared within the network, he used a simple algorithm to encrypt the document that just rearranges the same characters to produce the ciphertext.
Identify the type of cipher employed by Kevin in the above scenario.
A transposition cipher is a type of cipher that encrypts a document by rearranging the same characters to produce the ciphertext. A transposition cipher does not change the identity or frequency of the characters, but only their position. A transposition cipher can use various methods to permute the characters, such as writing them in a grid and reading them in a different order, or shifting them along a rail fence pattern. A transposition cipher is a simple and fast algorithm, but it can be easily broken by frequency analysis or anagramming. A transposition cipher is the type of cipher employed by Kevin in the above scenario, as he used a simple algorithm to encrypt the document that just rearranges the same characters to produce the ciphertext. Reference:
Transposition cipher - Wikipedia
Network Security: Transposition Cipher Techniques - Coding Streets
Network Defense Essentials (NDE) | Coursera - Module 4: Cryptography Techniques
Columnar Transposition Cipher - GeeksforGeeks
Alice was working on her major project; she saved all her confidential files and locked her laptop. Bob wanted to access Alice's laptop for his personal use but was unable to access the laptop due to biometric authentication.
Which of the following network defense approaches was employed by Alice on her laptop?
The network defense approach that was employed by Alice on her laptop was the preventive approach. The preventive approach aims to stop or deter potential attacks before they happen by implementing security measures that reduce the attack surface and increase the difficulty of exploitation. Biometric authentication is an example of a preventive measure that uses a physical characteristic, such as a fingerprint, iris, or face, to verify the identity of the user and grant access to the device or system. Biometric authentication is more secure than traditional methods, such as passwords or PINs, because it is harder to forge, guess, or steal. By locking her laptop and using biometric authentication, Alice prevented Bob from accessing her laptop and her confidential files without her permission. Reference:
Network Defense Essentials Courseware, EC-Council, 2020, pp. 1-7 to 1-8
What is Biometric Authentication?, Norton, July 29, 2020
An introduction to network defense basics, Enable Sysadmin, November 26, 2019
Below is the list of encryption modes used in a wireless network.
1.WPA2 Enterprise with RADIUS
2.WPA3
3.WPA2 PSK
4.WPA2 Enterprise
Identify the correct order of wireless encryption modes in terms of security from high to low.
Explore
The correct order of wireless encryption modes in terms of security from high to low is 2 -> 1 -> 4 -> 3. This is based on the following comparison of the wireless encryption modes:
WPA3: WPA3 is the latest and most secure wireless encryption mode, introduced in 2018 as a successor to WPA2. WPA3 uses the AES encryption protocol and provides several security enhancements, such as stronger password protection, individualized encryption, forward secrecy, and protection against brute-force and dictionary attacks. WPA3 also supports two modes: WPA3-Personal and WPA3-Enterprise, which offer different levels of security for home and business networks. WPA3-Personal uses Simultaneous Authentication of Equals (SAE) to replace the Pre-Shared Key (PSK) method and provide more robust password-based authentication. WPA3-Enterprise uses 192-bit cryptographic strength to provide additional protection for sensitive data and networks123.
WPA2 Enterprise with RADIUS: WPA2 Enterprise with RADIUS is a wireless encryption mode that combines the security features of WPA2 Enterprise and the authentication features of RADIUS. WPA2 Enterprise is a mode of WPA2 that uses the AES encryption protocol and provides stronger security than WPA2 Personal, which uses the PSK method. WPA2 Enterprise uses the 802.1X standard to implement Extensible Authentication Protocol (EAP) methods, such as EAP-TLS, EAP-TTLS, or PEAP, to authenticate users and devices before granting access to the network. RADIUS is a protocol that allows a central server to manage authentication, authorization, and accounting for network access. RADIUS can integrate with WPA2 Enterprise to provide centralized and scalable authentication for large and complex networks, such as corporate or campus networks .
WPA2 Enterprise: WPA2 Enterprise is a wireless encryption mode that uses the AES encryption protocol and provides stronger security than WPA2 Personal, which uses the PSK method. WPA2 Enterprise uses the 802.1X standard to implement Extensible Authentication Protocol (EAP) methods, such as EAP-TLS, EAP-TTLS, or PEAP, to authenticate users and devices before granting access to the network. WPA2 Enterprise is suitable for business or public networks that require individual and secure authentication for each user or device .
WPA2 PSK: WPA2 PSK is a wireless encryption mode that uses the AES encryption protocol and provides better security than WEP or WPA, which use the TKIP encryption protocol. WPA2 PSK uses the Pre-Shared Key (PSK) method, which means that all users and devices share the same password or passphrase to join the network. WPA2 PSK is easy to set up and use, but it has some security drawbacks, such as being vulnerable to brute-force and dictionary attacks, or having the password compromised by a rogue user or device. WPA2 PSK is suitable for home or small networks that do not require individual authentication or advanced security features .
Wi-Fi Security: Should You Use WPA2-AES, WPA2-TKIP, or Both? - How-To Geek, How-To Geek, March 12, 2023
WiFi Security: WEP, WPA, WPA2, WPA3 And Their Differences - NetSpot, NetSpot, February 8, 2024
What is WPA3? And some gotchas to watch out for in this Wi-Fi security upgrade - CSO Online, CSO Online, November 18, 2020
[Types of Wireless Security Encryption - GeeksforGeeks], GeeksforGeeks, 2020
[Wireless Security Protocols: WEP, WPA, and WPA2 - Lifewire], Lifewire, February 17, 2021
[WPA vs. WPA2 vs. WPA3: Wi-Fi Security Explained - MakeUseOf], MakeUseOf, January 13, 2021
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