Book Image

CCNA Routing and Switching 200-125 Certification Guide

By : Lazaro (Laz) Diaz
Book Image

CCNA Routing and Switching 200-125 Certification Guide

By: Lazaro (Laz) Diaz

Overview of this book

Cisco Certified Network Associate (CCNA) Routing and Switching is one of the most important qualifications for keeping your networking skills up to date. CCNA Routing and Switching 200-125 Certification Guide covers topics included in the latest CCNA exam, along with review and practice questions. This guide introduces you to the structure of IPv4 and IPv6 addresses and examines in detail the creation of IP networks and sub-networks and how to assign addresses in the network. You will then move on to understanding how to configure, verify, and troubleshoot layer 2 and layer 3 protocols. In addition to this, you will discover the functionality, configuration, and troubleshooting of DHCPv4. Combined with router and router simulation practice, this certification guide will help you cover everything you need to know in order to pass the CCNA Routing and Switching 200-125 exam. By the end of this book, you will explore security best practices, as well as get familiar with the protocols that a network administrator can use to monitor the network.
Table of Contents (24 chapters)
4
Subnetting in IPv4
21
Mock Test Questions
22
Assessments

Subnetting in IPv4

Well, I hope you're ready. As we learned in the previous chapter, there is a bunch of different IPv4 addresses, and they are divided into classes, even into public and private addresses.

I never told you, exactly, how many IPv4 addresses there are in total. But, so you know, there are 2.4 million addresses. That is quite a lot of addresses, is it not? But, I did keep saying, based on the default mask of the address, especially a Class A address, we have millions of addresses. That's where the problem begins.

The powers that do not create things for a good reason now. When they saw that the IPv4 addresses were slowly being used up, they were very surprised and scared. Nobody expected that the internet was going to grow exponentially. Everyone had not one but two or more devices that needed IP addresses, and a greater number of companies had a presence...