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CompTIA Network+ Certification Guide

You're reading from  CompTIA Network+ Certification Guide

Product type Book
Published in Dec 2018
Publisher
ISBN-13 9781789340501
Pages 422 pages
Edition 1st Edition
Languages
Authors (2):
Glen D. Singh Glen D. Singh
Profile icon Glen D. Singh
Rishi Latchmepersad Rishi Latchmepersad
Profile icon Rishi Latchmepersad
View More author details
Toc

Table of Contents (17) Chapters close

Preface 1. The OSI Reference Model and the TCP/IP Stack 2. Network Ports, Protocols, and Topologies 3. Ethernet 4. Understanding IPv4 and IPv6 5. Routing and Switching Concepts 6. Wireless and Cloud Technologies 7. Network Components 8. Network Virtualization and WAN Technologies 9. Business Continuity and Disaster Recovery Concepts 10. Network Identity Management and Policies 11. Network Security Concepts 12. TCP/IP Security 13. Organizational Security 14. Troubleshooting a Network 15. Assessment 16. Other Books You May Enjoy

Network Address Translation (NAT)

As we learned in Chapter 4, Understanding IPv4 and IPv6, there are a finite number of IPv4 addresses that can be publicly assigned to devices that are connected directly to the internet. Imagine if each device, both in a LAN (computers, servers, printers, and so on) and the internet, all had a unique public IPv4 address. The pool of public IPv4 addresses would have been exhausted many years ago, probably before the creation of smartphone and Internet of Things (IoT) devices.

The private IPv4 address space, defined by RFC 1918, was designed for IP networks within an organization and not on the internet. As we learned in the previous chapter, the private IPv4 address space is not unique per organization. The following is the private IPv4 address range:

Now, the following questions arise—how can organizations communicate on the internet with...

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