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Prepare for the Eccouncil Network Defense Essentials Exam exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.
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The questions for 112-51 were last updated on Feb 21, 2025.
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Below are the various steps involved in establishing a network connection using the shared key
authentication process.
1.The AP sends a challenge text to the station.
2.The station connects to the network.
3.The station encrypts the challenge text using its configured 128-bit key and sends the encrypted text to the AP.
4.The station sends an authentication frame to the AP.
5.The AP uses its configured WEP key to decrypt the encrypted text and compares it with the original challenge text.
What is the correct sequence of steps involved in establishing a network connection using the shared key authentication process?
The correct sequence of steps involved in establishing a network connection using the shared key authentication process is 4 -> 1 -> 3 -> 5 -> 2. This is based on the following description of the shared key authentication process from the Network Defense Essentials courseware:
The station sends an authentication frame to the AP, indicating that it wants to use shared key authentication.
The AP responds with an authentication frame containing a challenge text, which is a random string of bits.
The station encrypts the challenge text using its configured WEP key, which is derived from the shared secret key (password) that is also known by the AP. The station sends the encrypted text back to the AP in another authentication frame.
The AP decrypts the encrypted text using its configured WEP key and compares it with the original challenge text. If they match, the AP sends a positive authentication response to the station. If they do not match, the AP sends a negative authentication response to the station.
The station connects to the network if the authentication is successful.
Network Defense Essentials Courseware, EC-Council, 2020, pp. 3-18 to 3-19
Shared Key Authentication - Techopedia, Techopedia, June 15, 2017
John is working as a security professional in FinCorp Ltd. He was instructed to deploy a security solution on their corporate network that provides real-time monitoring, correlation of events, threat detection, and security incident response activities.
Which of the following security solutions helps John in the above scenario?
Finch, a security professional, was instructed to strengthen the security at the entrance. At the doorway, he implemented a security mechanism that allows employees to register their retina scan and a unique six- digit code, using which they can enter the office at any time.
Which of the following combinations of authentication mechanisms is implemented in the above scenario?
Joseph, a security professional, was instructed to secure the organization's network. In this process, he began analyzing packet headers to check whether any indications of source and destination IP addresses and port numbers are being changed during transmission.
Identify the attack signature analysis technique performed by Joseph in the above scenario.
Atomic-signature-based analysis is a type of attack signature analysis technique that uses a single characteristic or attribute of a packet header to identify malicious traffic. Atomic signatures are simple and fast to match, but they can also generate false positives or miss some attacks. Some examples of atomic signatures are source and destination IP addresses, port numbers, protocol types, and TCP flags. Atomic-signature-based analysis is the technique performed by Joseph in the above scenario, as he analyzed packet headers to check whether any indications of source and destination IP addresses and port numbers are being changed during transmission. Reference:
[Understanding the Network Traffic Signatures] - Module 12: Network Traffic Monitoring
Network Defense Essentials (NDE) | Coursera - Week 12: Network Traffic Monitoring
[Network Defense Essentials Module 12 (Network Traffic Monitoring) - Quizlet] - Flashcards: What are Network Traffic Signatures?
Which of the following tools is designed to identify and prevent malicious Trojans or malware from infecting computer systems or electronic devices?
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