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Trust the best selling Official Cert Guide series from Cisco Press to help you learn, prepare, and practice for exam success. This series is built with the objective of providing assessment, review, and practice to help ensure you are fully prepared for your certification exam.
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?" 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.
CCNA Wireless 200-355 Official Cert Guide focuses specifically on the objectives for the Cisco CCNA WIFUND exam. 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.
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 200-355 exam, including
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 http://www.cisco.com/web/learning/index.html.
Autorentext
David Hucaby, CCIE No. 4594, is a network engineer for a large university healthcare network based on Cisco wireless products. David has bachelor's and master's degrees in electrical engineering from the University of Kentucky. He is the author of several Cisco Press titles, including 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.
David lives in Kentucky with his wife, Marci, and two daughters.
Inhalt
Introduction
Chapter 1 RF Signals and Modulation 3
"Do I Know This Already?" 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
FHSS 26
DSSS 27
1-Mbps Data Rate 28
2-Mbps Data Rate 28
5.5-Mbps Data Rate 29
11-Mbps Data Rate 30
OFDM 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?" Quiz 37
Foundation Topics 41
Regulatory Bodies 41
ITU-R 41
FCC 42
ETSI 44
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?" 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?" 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?" 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?" Quiz 129
Foundation Topics 132
802.11 Frame Format 132
802.11 Frame Addressing 134
Accessing the Wireless Medium 136
Carrier Sense 137
Collision Avoidance 137
802.11 Frame Types 140
Management Frames 140
Control Frames 141
Data Frames 142
Client Housekeeping 142
A Client Scans for APs 143
A Client Joins a BSS 144
A Client Leaves a BSS 145
A Client Moves Between BSSs 146
A Client Saves Power 147
Exam Preparation Tasks 151
Review All Key Topics 151
Define Key Terms 151
Chapter 7 Planning Coverage with Wireless APs 153
"Do I Know This Already?" Quiz 153
Foundation Topics 157
AP Cell Size 157
Tuning Cell Size with Transmit Power 157
Tuning Cell Size with Data Rates 159
Adding APs to an ESS 162
The Roaming Process 163
WLAN Channel Layout 165
Designing and Validating Coverage with Site Surveys 169
Applications and Their Requirements 169
Site Survey Types and Tools 171
Predictive or Planning Surveys 172
Passive Site Surveys 174
Active Site Surveys 175
Developing a Complete Survey Strategy 178
Exam Preparation Tasks 180
Review All Key Topics 180
Define Key Terms 180
Site Survey Type and Application Hig…