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)
1
Section 1: Where Every Hacker Starts
10
Section 2: A Plethora of Attack Vectors
15
Section 3: Cloud, Apps, and IoT Attacks
20
Chapter 17: CEH Exam Practice Questions

Scanning by thinking outside the box

So, when we scan a network, we have some tricks that can be used to get a system to respond without being detected. Now, the normal three-way handshake we know about involves a SYN followed by a SYN/ACK and then an ACK. What if we change up the order of the handshake and craft packets so that we send a SYN/ACK first? Or a FIN? Using these types of methods, we can pick up targets on the network that normally wouldn't respond to an ICMP scan. Let's talk about some of these scans.

Full scans

A full scan is simply the same process that we talked about previously – the three-way handshake. It's just that here, while a computer is talking to another, an attacker is going after a target. What they'll do is send a standard SYN. Attached to that SYN, we'll have a port number.

As you may remember from the three-way handshake, it'll simply respond with a SYN/ACK. And now that we've seen the acknowledgment...