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

The evolution of networks

To be a professional network engineer, you need to know the differences between internet-working devices, such as repeaters, hubs, bridges, switches, and routers.

In the dawn of networks, we used a topology called a bus, which was simply one main cable, usually a coaxial cable, that every other node was connected to using vampire taps, and the PCs used NIC cards that had BNC connectors.

These networks served their purpose at the time when bus topologies and coaxial cable were used for networking, but it was extremely slow, and if there was a break in any part of the cable, the entire network would be down. That means no one could send or receive any information. Why? Because the broken part of the cable would send signals back onto the network called reflection, and all computers would hear noise on the network and not transmit.

But it did not have to...