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CCNA Wireless 200-355 Official Cert Guide presents you with an organized test-preparation routine through the use of proven series elements and techniques. ´Do I Know This Already?ö quizzes open each chapter and enable you to decide how much time you need to spend on each section. Exam topic lists make referencing easy. Chapter-ending Exam Preparation Tasks help you drill on key concepts you must know thoroughly.

· Master Cisco CCNA 200-355 exam topics

· Assess your knowledge with chapter-opening quizzes

· Review key concepts with exam preparation tasks

· Practice with realistic exam questions on the DVD

CCNA Wireless 200-355 Official Cert Guide focuses specifically on the objectives for the Cisco CCNA WIFUND 200-355exam. Leading network engineer and best-selling Cisco certification author 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. Material is presented in a concise manner, focusing on increasing your understanding and retention of exam topics.

The companion DVD contains a powerful Pearson IT Certification Practice Test engine that enables you to focus on individual topic areas or take a complete, timed exam. The assessment engine also tracks your performance and provides feedback on a module-by-module basis, laying out a complete assessment of your knowledge to help you focus your study where it is needed most.

Well regarded for its level of detail, assessment features, comprehensive design scenarios, and challenging review questions and exercises, this official study guide helps you master the concepts and techniques that will enable you to succeed on the exam the first time.

The official study guide helps you master all the topics on the CCNA WIFUND exam, including

RF signals, modulations, standards, and performance
Antenna theory
Wireless LAN topologies and 802.11 frame types
Wireless AP coverage planning
Cisco wireless architectures
Autonomous, cloud, and controller-based deployments
Controller discovery, roaming, and RRM
Wireless security
WLAN configuration
Wireless guest network implementation
Client connectivity
Cisco wireless network management
Troubleshooting interference and connectivity

CCNA Wireless 200-355 Official Cert Guide is part of a recommended learning path from Cisco that includes simulation and hands-on training from authorized Cisco Learning Partners and self-study products from Cisco Press. To find out more about instructor-led training, e-learning, and hands-on instruction offered by authorized Cisco Learning Partners worldwide, please visit

The print edition of the CCNA Wireless 200-355 Official Cert Guide contains two free, complete practice exams.

Also available from Cisco Press for Cisco CCNA study is the CCNA Wireless 200-355 Official Cert Guide Premium Edition eBook and Practice Test. This digital-only certification preparation product combines an eBook with enhanced Pearson IT Certification Practice Test.

This integrated learning package

· Enables you to focus on individual topic areas or take complete, timed exams

· Includes direct links from each question to detailed tutorials to help you understand the concepts behind the questions

· Provides unique sets of exam-realistic practice questions

· Tracks your performance and provides feedback on a module-by-module basis, laying out a complete assessment of your knowledge to help you focus your study where it is needed most


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 7

Understanding Frequency 9

Understanding Phase 14

Measuring Wavelength 14

Understanding RF Power and dB 15

Important dB Laws 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 28

5.5-Mbps Data Rate 29

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 50

802.11-1997 51

802.11b 51

802.11g 52

802.11a 53

802.11n 54

Channel Aggregation 55

Spatial Multiplexing 57

MAC Layer Efficiency 58

Transmit Beamforming 59

Maximal-Ratio Combining 60

802.11n Modulation and Coding Schemes 60

802.11ac 60

Robust Channel Aggregation 61

Dense Modulation 63

MAC Layer Efficiency 63

Explicit Transmit Beamforming 64

Scalable MIMO 64

Multi-user MIMO 64

802.11ac Implementation 65

802.11 in Other Frequency Bands 65

Wi-Fi Alliance 66

Exam Preparation Tasks 68

Review All Key Topics 68

802.11 Protocol Summary 68

Define Key Terms 69

Chapter 3 RF Signals in the Real World 71

"Do I Know This Already?ö Quiz 71

Foundation Topics 74

Interference 74

Co-Channel Interference 74

Neighboring Channel Interference 75

Non-802.11 Interference 76

Free Space Path Loss 77

Mitigating the Effects of Free Space Path Loss 79

Effects of Physical Objects 80

Reflection 81

Absorption 82

Scattering 83

Refraction 83

Diffraction 84

Fresnel Zones 84

Exam Preparation Tasks 88

Review All Key Topics 88

Define Key Terms 88

Chapter 4 Understanding Antennas 91

"Do I Know This Already?ö Quiz 91

Foundation Topics 94

Antenna Characteristics 94

Radiation Patterns 94

Gain 97

Beamwidth 97

Polarization 98

Antenna Types 99

Omnidirectional Antennas 99

Directional Antennas 103

Antenna Summary 107

Adding Antenna Accessories 107

Exam Preparation Tasks 109

Review All Key Topics 109

Define Key Terms 109

Chapter 5 Wireless LAN Topologies 111

"Do I Know This Already?ö Quiz 111

Foundation Topics 114

Types of Wireless Networks 114

Wireless LAN Topologies 115

Basic Service Set 116

Distribution System 118

Extended Service Set 120

Independent Basic Service Set 122

Other Wireless Topologies 122

Repeater 122

Workgroup Bridge 123

Outdoor Bridge 124

Mesh Network 125

Exam Preparation Tasks 126

Review All Key Topics 126

Define Key Terms 126

Chapter 6 Understanding 802.11 Frame Types 129

"Do I Know This Already?ö Quiz 129

Foundation Topics 132

802.11 Frame Format 132

802.11 Frame Addressing 134

Accessing the Wireless Medium 136