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CompTIA Network+ Certification Guide

You're reading from   CompTIA Network+ Certification Guide The ultimate guide to passing the N10-007 exam

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Product type Paperback
Published in Dec 2018
Publisher
ISBN-13 9781789340501
Length 422 pages
Edition 1st Edition
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Authors (2):
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Glen D. Singh Glen D. Singh
Author Profile Icon Glen D. Singh
Glen D. Singh
Rishi Latchmepersad Rishi Latchmepersad
Author Profile Icon Rishi Latchmepersad
Rishi Latchmepersad
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Toc

Table of Contents (17) Chapters Close

Preface 1. The OSI Reference Model and the TCP/IP Stack 2. Network Ports, Protocols, and Topologies FREE CHAPTER 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

Frequencies

As you probably have noticed already, during all of our discussions of 802.11 and Wi-Fi, the only two frequency bands that are currently in use are the 2.4 GHz and 5 GHz ranges. The IEEE 802.11 standard outlines the use of particular frequencies within the 2.4 GHz and 5 GHz ranges. Since the frequencies are a bit challenging to remember all of the time, the IEEE put these frequencies into groups, which are known as channels.

A frequency of 20 MHz is like a small water line; if we increased the size of the water line to 40 MHz, there would be an increased in the capacity of water supported by the line. In the 802.11 standard, an access point either can use a single 20 MHz frequency for transmitting data or can combine multiple 20 MHz frequencies to achieve a higher data rate.

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