Book Image

Implementing and Administering Cisco Solutions: 200-301 CCNA Exam Guide

By : Glen D. Singh
Book Image

Implementing and Administering Cisco Solutions: 200-301 CCNA Exam Guide

By: Glen D. Singh

Overview of this book

In the dynamic technology landscape, staying on top of the latest technology trends is a must, especially if you want to build a career in network administration. Achieving CCNA 200-301 certification will validate your knowledge of networking concepts, and this book will help you to do just that. This exam guide focuses on the fundamentals to help you gain a high-level understanding of networking, security, IP connectivity, IP services, programmability, and automation. Starting with the functions of various networking components, you’ll discover how they are used to build and improve an enterprise network. You’ll then delve into configuring networking devices using a command-line interface (CLI) to provide network access, services, security, connectivity, and management. The book covers important aspects of network engineering using a variety of hands-on labs and real-world scenarios that will help you gain essential practical skills. As you make progress, this CCNA certification study guide will help you get to grips with the solutions and technologies that you need to implement and administer a broad range of modern networks and IT infrastructures. By the end of this book, you’ll have gained the confidence to pass the Cisco CCNA 200-301 exam on the first attempt and be well-versed in a variety of network administration and security engineering solutions.
Table of Contents (26 chapters)
1
Section 1: Network Fundamentals
6
Section 2: Network Access
9
Section 3: IP Connectivity
12
Section 4: IP Services
15
Section 5: Security Fundamentals
20
Section 6: Automation and Programmability
22
Chapter 16: Mock Exam 1
23
Chapter 17: Mock Exam 2

Understanding NAT

A device that is assigned a private IPv4 address is not able to simply communicate with devices on the internet on its own—it needs some assistance. For example, your computer or smart device is mostly likely assigned a private IPv4 address on your network, but it's able to connect to devices on the internet. This is because of something called NAT. NAT makes our lives in networking that bit easier as it allows a router to translate a private address into a public address. Let's take a look at the following diagram to get a clear idea of how NAT really works:

Figure 9.2 – NAT topology

In the preceding figure, there are two networks—a corporate network and the internet—and in between both is a NAT router. Let's imagine that there is a device on the corporate network, PC 1, with an IP address of 192.168.1.10. PC 1 wants to send a message to a device on the internet, let's say a Cisco web server...