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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 Mar 29, 2025.
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Which of the following techniques protects sensitive data by obscuring specific areas with random
characters or codes?
John has recently joined an organization and completed his security training. The organization conducted a security campaign on their employees by sending a fake email stating the urgency of password reset. John identified that it was an illegitimate mail and reported it as spam.
Identify the type of attack initiated by the organization as part of the security campaign discussed in the above scenario.
Peter, a security professional, was hired by an organization and was instructed to secure the application and its content from unauthorized access. In this process, Peter implemented a public-key cryptosystem that uses modular arithmetic and elementary number theory for Internet encryption and user authentication.
Which of the following algorithms was employed by Peter in the above scenario?
Barbara, a security professional, was monitoring the loT traffic through a security solution. She identified that one of the infected devices is trying to connect with other loT devices and spread malware onto the network. Identify the port number used by the malware to spread the infection to other loT devices.
Port 48101 is the port number used by the malware to spread the infection to other loT devices. This port is associated with the Mirai botnet, which is one of the most notorious loT malware that targets vulnerable loT devices and turns them into a network of bots that can launch distributed denial-of-service (DDoS) attacks. Mirai scans the internet for loT devices that use default or weak credentials and infects them by logging in via Telnet or SSH. Once infected, the device connects to a command and control (C&C) server on port 48101 and waits for instructions. The C&C server can then direct the botnet to attack a target by sending TCP, UDP, or HTTP requests. Mirai has been responsible for some of the largest DDoS attacks in history, such as the one that disrupted Dyn DNS in 2016 and affected major websites like Twitter, Netflix, and Reddit. Reference:
Mirai (malware), Wikipedia, March 16, 2021
Mirai Botnet: A History of the Largest loT Botnet Attacks, Imperva, December 10, 2020
Mirai Botnet: How loT Devices Almost Brought Down the Internet, Cloudflare, March 17, 2021
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.
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