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

Types of NAT and its configuration

As you can see from the preceding diagram, we have a private network using the private IP address 192.168.1.0/24 and public network using the public IP address 1.1.1.0/24 network. The public network is using a web server that I configured with DNS, so we can see different ports when NAT translates the private address to public.

We can configure using three different methods, so I will explain the three different types and compare them. The first one I am going to break down is static NAT, which is neither very feasible nor efficient. While configuring static NAT, you must manually pair up each private address with a public address.

If you have 1,000 nodes that need internet access, you will have to purchase 1,000 public IPs and in today's technological era, it will run into thousands of dollars. This is how you would configure static NAT...