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CCNA Wireless 640-722 Official Cert Guide

CCNA Wireless 640-722 Official Cert Guide from Cisco Press enables you to succeed on the Implementing Cisco Unified Wireless Networking Essentials (IUWNE) exam the first time and is the only self-study resource approved by Cisco. Best-selling author and expert instructor David Hucaby shares preparation hints and test-taking tips, helping you identify areas of weakness and improve both your conceptual knowledge and hands-on skills.

This complete study package includes

n A test-preparation routine proven to help you pass the exams

n Do I Know This Already? quizzes, which enable you to decide how much time you need to spend on each section

n Chapter-ending exercises, which help you drill on key concepts you must know thoroughly

n The powerful Pearson IT Certification Practice Test software, complete with hundreds of well reviewed, exam-realistic questions, customization options, and detailed performance reports

n A final preparation chapter, which guides you through tools and resources to help you craft your review and test-taking strategies

n Study plan suggestions and templates to help you organize and optimize your study time

Well regarded for its level of detail, study plans, assessment features, challenging review questions, and hands-on exercises, this official study guide helps you master the concepts and techniques you need to ensure exam success.

David Hucaby, CCIE® No. 4594, is a network architect for the University of Kentucky, where he works with academic and healthcare networks based on the Cisco Unified Wireless Network products. David holds bachelor's and master's degrees in electrical engineering from the University of Kentucky. His Cisco Press titles include CCNP SWITCH Exam Certification Guide; Cisco LAN Switching Video Mentor; CCNP Security FIREWALL Exam Certification Guide; Cisco ASA, PIX, and FWSM Firewall Handbook, Second Edition; and Cisco Firewall Video Mentor.

The official study guide helps you master all the topics on the CCNA Wireless 640-722 exam, including the following:

n RF signals, modulation, and standards

n Antennas

n WLAN topologies, configuration, and troubleshooting

n Wireless APs

n CUWN architecture

n Controller configuration, discovery, and maintenance

n Roaming

n Client configuration


n Wireless security

n Guest networks

n WCS network management

n Interference

Companion CD

The CD contains 170 unique practice exam questions for the CCNA Wireless 640-722 exam in two highly realistic, interactive practice exams. Includes Exclusive Offer for 70% Off Premium Edition eBook and Practice Test

170 Practice Exam Questions in Two Highly Realistic Sample Exams

Introduction xix

Chapter 1 RF Signals and Modulation 3

"Do I Know This Already?ö Quiz 3

Foundation Topics 7

Comparing Wired and Wireless Networks 7

Understanding Basic Wireless Theory 8

Understanding Frequency 10

Understanding Phase 14

Measuring Wavelength 14

Understanding RF Power and dB 15

Important dB Facts to Remember 17

Comparing Power Against a Reference: dBm 19

Measuring Power Changes Along the Signal Path 20

Understanding Power Levels at the Receiver 23

Carrying Data Over an RF Signal 24



1-Mbps Data Rate 28

2-Mbps Data Rate 29

5.5-Mbps Data Rate 30

11-Mbps Data Rate 30


Modulation Summary 32

Exam Preparation Tasks 34

Review All Key Topics 34

Key Terms 34

Chapter 2 RF Standards 37

"Do I Know This Already?ö Quiz 37

Foundation Topics 41

Regulatory Bodies 41

ITU-R 41

FCC 42


Other Regulatory Bodies 45

IEEE Standards Body 45

802.11 Channel Use 47

Channels in the 2.4-GHz ISM Band 47

Channels in the 5-GHz U-NII Bands 49

IEEE 802.11 Standards 51

802.11-1997 52

802.11b 52

802.11g 52

802.11a 54

802.11n 55

Channel Aggregation 57

Spatial Multiplexing 58

MAC Layer Efficiency 59

Transmit Beam Forming (T×BF) 60

Maximal-Ratio Combining 61

802.11n Modulation and Coding Schemes 61

Beyond 802.11n 62

Wi-Fi Alliance 63

Exam Preparation Tasks 64

Review All Key Topics 64

Define Key Terms 64

Chapter 3 RF Signals in the Real World 67

"Do I Know This Already?ö Quiz 67

Foundation Topics 70

Interference 70

Co-Channel Interference 70

Neighboring Channel Interference 71

Non-802.11 Interference 72

Free Space Path Loss 72

Mitigating the Effects of Free Space Path Loss 74

Effects of Physical Objects 76

Reflection 76

Absorption 78

Scattering 78

Refraction 79

Diffraction 80

Fresnel Zones 80

Exam Preparation Tasks 83

Review All Key Topics 83

Define Key Terms 83

Chapter 4 Understanding Antennas 85

"Do I Know This Already?ö Quiz 85

Foundation Topics 88

Antenna Characteristics 88

Radiation Patterns 88

Gain 91

Beamwidth 92

Polarization 92

Antenna Types 93

Omnidirectional Antennas 94

Directional Antennas 97

Antenna Summary 101

Adding Antenna Accessories 101

Exam Preparation Tasks 103

Review All Key Topics 103

Define Key Terms 103

Chapter 5 Wireless LAN Topologies 105

"Do I Know This Already?ö Quiz 105

Foundation Topics 108

Types of Wireless Networks 108

Wireless LAN Topologies 109

Basic Service Set 110

Distribution System 112

Extended Service Set 114

Independent Basic Service Set 115

Other Wireless Topologies 116

Repeater 116

Workgroup Bridge 117

Outdoor Bridge 118

Mesh Network 119

Exam Preparation Tasks 120

Review All Key Topics 120

Define Key Terms 120

Chapter 6 Understanding 802.11 Frame Types 123

"Do I Know This Already?ö Quiz 123

802.11 Frame Format 126

802.11 Frame Addressing 128

Accessing the Wireless Medium 130

Carrier Sense 131

Collision Avoidance 132

802.11 Frame Types 134

Management Frames 134

Control Frames 135

Data Frames 136

Client Housekeeping 136

A Client Scans for APs 137

A Client Joins a BSS 138

A Client Leaves a BSS 139

A Client Moves Between BSSs 140

A Client Saves Power 142

Exam Preparation Tasks 145

Review All Key Topics 145

Define Key Terms 145

Chapter 7 Planning Coverage with Wireless APs 147

"Do I Know This Already?ö Quiz 147

AP Cell Size 150

Tuning Cell Size with Transmit Power 150

Tuning Cell Size with Data Rates 152

Adding APs to an ESS 153

The Roaming Process 155

WLAN Channel Layout 157

Exam Preparation Tasks 161

Review All Key Topics 161

Define Key Terms 161

Chapter 8 Using Autonomous APs 163

"Do I Know This Already?ö Quiz 163

Foundation Topics 166

Autonomous Architecture 166

Configuring an Autonomous AP 167

Connecting the AP 167

Configuring the AP 170

Converting an Autonomous AP 174

Using the Autonomous to Lightweight Mode Upgrade Tool 174

Converting an Autonomous AP Manually 176