David D. Coleman, David A. Westcott

CWNA Certified Wireless Network Administrator Study Guide (eBook, ePUB)

Exam CWNA-108

• Format: ePub

Produktbeschreibung

The #1 selling Wi-Fi networking reference guide in the world The CWNA: Certified Wireless Network Administrator Study Guide is the ultimate preparation resource for the CWNA exam. Fully updated to align with the latest version of the exam, this book features expert coverage of all exam objectives to help you pass the exam. But passing the exam is just a first step. For over 16 years, the CWNA Study Guide has helped individuals jump-start their wireless networking careers. Wireless networking professionals across the globe use this book as their workplace reference guide for enterprise Wi-Fi technology. Owning this book provides you with a foundation of knowledge for important Wi-Fi networking topics, including: * Radio frequency (RF) fundamentals * 802.11 MAC and medium access * Wireless LAN topologies and architecture * WLAN design, troubleshooting and validation * Wi-Fi networking security The book authors have over 40 years of combined Wi-Fi networking expertise and provide real-world insights that you can leverage in your wireless networking career. Each of the book's 20 chapters breaks down complex topics into easy to understand nuggets of useful information. Each chapter has review questions that help you gauge your progress along the way. Additionally, hands-on exercises allow you to practice applying CWNA concepts to real-world scenarios. You also get a year of free access to the Sybex online interactive learning environment, which features additional resources and study aids, including bonus practice exam questions. The CWNA certification is a de facto standard for anyone working with wireless technology. It shows employers that you have demonstrated competence in critical areas, and have the knowledge and skills to perform essential duties that keep their wireless networks functioning and safe. The CWNA: Certified Wireless Network Administrator Study Guide gives you everything you need to pass the exam with flying colors.

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Produktdetails

• Verlag: John Wiley & Sons
• Seitenzahl: 1088
• Erscheinungstermin: 17. Februar 2021
• Englisch
• ISBN-13: 9781119734536
• Artikelnr.: 62249995

Autorenporträt

DAVID D. COLEMAN, CWNE #4, David D. Coleman, CWNE #4, is a technology evangelist and public speaker who specializes in Wi-Fi and cloud technologies. David is also Director of Product Marketing for Extreme Networks. He is the author of numerous books, white papers and videos about Wi-Fi technology. DAVID A. WESTCOTT, CWNE #7, is an independent consultant and WLAN technical trainer of thirty years. He provides vendor and custom wireless training to government agencies, corporations and universities around the world.

Inhaltsangabe

Foreword xxxv

Introduction xxxvii

Assessment Test lvi

Chapter 1 Overview of Wireless Standards, Organizations, and Fundamentals 1

History of Wireless Local Area Networks 3

Standards Organizations 5

Federal Communications Commission 5

International Telecommunication Union Radiocommunication Sector 6

Institute of Electrical and Electronics Engineers 8

Internet Engineering Task Force 9

Wi-Fi Alliance 11

International Organization for Standardization 21

Core, Distribution, and Access 22

Communications Fundamentals 24

Communication Terminology 24

Understanding Carrier Signals 25

Understanding Keying Methods 27

Summary 33

Exam Essentials 33

Review Questions 34

Chapter 2 IEEE 802.11 Standard and Amendments 39

Original IEEE 802.11 Standard 42

IEEE 802.11-2020 Ratified Amendments 44

802.11a-1999 45

802.11b-1999 46

802.11d-2001 47

802.11e-2005 47

802.11g-2003 48

802.11h-2003 50

802.11i-2004 52

802.11j-2004 53

802.11k-2008 53

802.11n-2009 54

802.11p-2010 55

802.11r-2008 55

802.11s-2011 56

802.11u-2011 57

802.11v-2011 58

802.11w-2009 58

802.11y-2008 59

802.11z-2010 59

802.11aa-2012 59

802.11ac-2013 59

802.11ad-2012 60

802.11ae-2012 61

802.11af-2014 61

802.11ah-2016 62

802.11ai-2016 63

802.11aj-2018 63

802.11ak-2018 63

802.11aq-2018 63

IEEE 802.11 Draft Amendments 63

802.11ax (High Efficiency) 64

802.11ay (Next-Generation 60 GHz) 65

802.11az (Next-Generation Positioning) 65

802.11ba (Wake-Up Radio) 65

802.11bb (Light Communications) 65

802.11bc (Enhanced Broadcast Service) 65

802.11bd (Enhancements for Next-Generation V2X) 65

802.11be (Extremely High Throughput) 66

Defunct Amendments 66

802.11F 66

802.11T 67

IEEE Task Group m 68

Summary 69

Exam Essentials 69

Review Questions 70

Chapter 3 Radio Frequency Fundamentals 75

What is a Radio Frequency Signal? 77

Radio Frequency Characteristics 78

Wavelength 78

Frequency 83

Amplitude 85

Phase 86

Radio Frequency Behaviors 87

Wave Propagation 87

Absorption 88

Reflection 89

Scattering 91

Refraction 91

Diffraction 92

Loss (Attenuation) 94

Free Space Path Loss 96

Multipath 98

Gain (Amplification) 101

RF Analysis Tools 102

Summary 103

Exam Essentials 103

Review Questions 104

Chapter 4 Radio Frequency Components, Measurements, and Mathematics 109

Components of RF Communications 112

Transmitter 112

Antenna 113

Receiver 114

Intentional Radiator 114

Equivalent Isotropically Radiated Power 114

Units of Power and Comparison 115

Watt 116

Milliwatt 117

Decibel 117

Decibels Relative to an Isotropic Radiator (dBi) 120

Decibels Relative to a Half-Wave Dipole Antenna (dBd) 120

Decibels Relative to 1 Milliwatt (dBm) 121

Inverse Square Law 122

RF Mathematics 123

Rule of 10s and