Book Image

Certified Ethical Hacker (CEH) v12 312-50 Exam Guide

By : Dale Meredith
Book Image

Certified Ethical Hacker (CEH) v12 312-50 Exam Guide

By: Dale Meredith

Overview of this book

With cyber threats continually evolving, understanding the trends and using the tools deployed by attackers to determine vulnerabilities in your system can help secure your applications, networks, and devices. To outmatch attacks, developing an attacker's mindset is a necessary skill, which you can hone with the help of this cybersecurity book. This study guide takes a step-by-step approach to helping you cover all the exam objectives using plenty of examples and hands-on activities. You'll start by gaining insights into the different elements of InfoSec and a thorough understanding of ethical hacking terms and concepts. You'll then learn about various vectors, including network-based vectors, software-based vectors, mobile devices, wireless networks, and IoT devices. The book also explores attacks on emerging technologies such as the cloud, IoT, web apps, and servers and examines prominent tools and techniques used by hackers. Finally, you'll be ready to take mock tests, which will help you test your understanding of all the topics covered in the book. By the end of this book, you'll have obtained the information necessary to take the 312-50 exam and become a CEH v11 certified ethical hacker.
Table of Contents (23 chapters)
Section 1: Where Every Hacker Starts
Section 2: A Plethora of Attack Vectors
Section 3: Cloud, Apps, and IoT Attacks
Chapter 17: CEH Exam Practice Questions

Detecting sniffing methods

There are different ways to detect sniffers on a network. Typically, a sniffer won't leave any type of trace because it doesn't transmit any data—it's only collecting data. So, knowing that, we need to look for devices or network interfaces on our network running in promiscuous mode.

Promiscuous mode simply means as packets go across the network, when they hit a computer, if that packet is not destined for that computer, the normal response is for it to ignore that packet altogether. If the packet goes out and reaches its destination, that computer holds the information or retains the packet. A NIC in promiscuous mode will see the packet, but instead of discarding it, it will add it to its tables or tracking mechanism.

In some cases, sniffers are easier to find because they may be running in active mode. If you remember, passive is just listening while active sniffing is injecting, as with Cain and Abel or dsniff.

When we...