Important Eccouncil 112-51 NDE Exam Questions

Answer: D

Explanation:

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?

Answer: C

Explanation:

Dtex Systems is 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. Dtex Systems is a user and entity behavior analytics (UEBA) platform that provides visibility, detection, and response capabilities for insider threats, compromised accounts, data loss, and fraud. Dtex Systems collects user activity data from endpoints, servers, cloud applications, and network traffic, and applies advanced analytics and machine learning to establish baselines of normal user behavior, identify anomalies, and assign risk scores. Dtex Systems also provides contextual information, such as user intent, motivation, and sentiment, to help security teams understand and respond to the threats. Dtex Systems can integrate with other security tools, such as SIEM, DLP, or IAM, to enhance the security posture of the organization123. Reference:

Network Defense Essentials Courseware, EC-Council, 2020, pp. 3-35 to 3-36

Dtex Systems - Wikipedia, Wikipedia, March 16, 2021

Dtex Systems - User and Entity Behavior Analytics (UEBA), Dtex Systems, 2020

Answer: B

Explanation:

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

Answer: B

Explanation:

Unauthorized access signatures were identified by Kalley through the installed monitoring system. Unauthorized access signatures are designed to detect attempts to gain unauthorized access to a system or network by exploiting vulnerabilities, misconfigurations, or weak credentials. Password cracking, sniffing, and brute-forcing are common techniques used by attackers to obtain or guess the passwords of legitimate users or administrators and gain access to their accounts or privileges. These techniques generate suspicious traffic patterns that can be detected by traffic monitoring systems, such as Snort, using signature-based detection. Signature-based detection is based on the premise that abnormal or malicious network traffic fits a distinct pattern, whereas normal or benign traffic does not. Therefore, by installing a traffic monitoring system and capturing and reporting suspicious traffic signatures, Kalley can identify and prevent unauthorized access attempts and protect the security of her organization's network. Reference:

Network Defense Essentials Courseware, EC-Council, 2020, pp. 3-33 to 3-34

Detecting Suspicious Traffic via Signatures - Intrusion Detection with Snort, O'Reilly, 2003

Threat Signature Categories - Palo Alto Networks, Palo Alto Networks, 2020

Answer: A