使用无线网络是一种获得解放的、自由的经历。但是，怎样构造网络才能让移动用户活动自如？怎样扩展无线网络才能让它在任何需要的地方都可用？无线网络会产生哪些安全问题？怎样把无线网络调整到最佳性能？本书讨论了上述所有问题及其他相关问题。本书主要是为部署或维护无线网络的严谨的系统管理员或网络管理员编写的。书中广泛讨论了无线网络的安全问题，包括使用WEP标准的安全问题，并讨论了动态WEP和802.1X、802.11i安全标准。如果你负责管理无线网络，你就需要这本书。

使用无线网络是一种获得解放的、自由的经历。但是在这种经历的背后存在着一个复杂的协议，并且当数据不只限于在物理线路上传输时，甚至会产生一些更为复杂的问题。怎样构造网络才能让移动用户活动自如？怎样扩展无线网络才能让它在任何需要的地方都可用？无线网络会产生哪些安全问题？怎样把无线网络调整到最佳性能？怎样提供足够的容量来支持最初希望的用户？怎样处理更多的用户接入网络所带来的各种问题？

《802.11无线网络权威指南》第二版讨论了上述所有问题及其他相关问题。本书主要是为部署或维护无线网络的严谨的系统管理员或网络管理员编写的。书中广泛讨论了无线网络的安全问题，包括使用WEP标准的安全问题，并讨论了动态WEP和802.1X、802.11i安全标准。由于对于任何严谨的网络管理员来说，网络监视都是一项必须的工作，因此本书有专门的章节阐述如何使用Ethereal及其他工具进行网络分析和排错。

《802.11无线网络权威指南》同时还介绍了无线网络的最新发展。除了802．11b和11a标准之外，本书同时涵盖802．11g，并前瞻了正在成为标准的802.11n协议。这个新的版本扩展了网络规划架构的讨论，并特别关注了访问点之间的移动性、频谱管理和功率控制。本书是目前唯一的讲述了如何衡量无线网络性能及如何调整网络到最佳性能的工具书。

最后，《802.11无线网络权威指南》展示了怎样配置无线网卡和Linux、Windows和MAC OS X系统，以及怎样处理访问点。很少有一本书能够把你需要掌握的理论和完成工作所需要的实际经验和建议有机地结合在一起。《802．11无线网络权威指南》就是这样的一本好书。如果你负责管理无线网络，你就需要这本书。

Matthew S. Gast是无线网络规划和部署方面的权威作者。

 Foreword

Preface

1. Introduction to Wireless Networking

 Why Wireless?

 What Makes Wireless Networks Different

 A Network by Any Other Name...

2. Overview of 802.11 Networks

 IEEE 802 Network Technology Family Tree

 802.11 Nomenclature and Design

 802.11 Network Operations

 Mobility Support

3. 802.11 MAC Fundamentals

 Challenges for the MAC

 MAC Access Modes and Timing

 Contention-Based Access Using the DCF

 Fragmentation and Reassembly

 Frame Format

 Encapsulation of Higher-Layer Protocols Within 802.11

 Contention-Based Data Service

 Frame Processing and Bridging

4. 802.11 Framing in Detail

 Data Frames

 Control Frames

 Management Frames

 Frame Transmission and Association and Authentication States

5. Wired Equivalent Privacy (WEP)

 Cryptographic Background to WEP

 WEP Cryptographic Operations

 Problems with WEP

 Dynamic WEP

6. User Authentication with 802.1X

 The Extensible Authentication Protocol

 EAP Methods

 802.1X: Network Port Authentication

 802.1X on Wireless LANs

7. 802.11i: Robust Security Networks, TKIP, and CCMP

 The Temporal Key Integrity Protocol (TKIP)

 Counter Mode with CBC-MAC (CCMP)

 Robust Security Network (RSN) Operations

8. Management Operations

 Management Architecture

 Scanning

 Authentication

 Preauthentication

 Association

 Power Conservation

 Timer Synchronization

 Spectrum Management

9. Contention-Free Service with the PCF

 Contention-Free Access Using the PCF

 Detailed PCF Framing

 Power Management and the PCF

10. Physical Layer Overview

 Physical-Layer Architecture

 The Radio Link

 RF Propagation with 802.11

 RF Engineering for 802.11

11. The Frequency-Hopping (FH) PHY

 Frequency-Hopping Transmission

 Gaussian Frequency Shift Keying (GFSK)

 FH PHY Convergence Procedure (PLCP)

 Frequency-Hopping PMD Sublayer

 Characteristics of the FH PHY

12. The Direct Sequence PHYs: DSSS and HR/DSSS (802.11b)

 Direct Sequence Transmission

 Differential Phase Shift Keying (DPSK)

 The "Original" Direct Sequence PHY

 Complementary Code Keying

 High Rate Direct Sequence PHY

13. 802.11a and 802.11j: 5-GHz OFDM PHY

 Orthogonal Frequency Division Multiplexing (OFDM)

 OFDM as Applied by 802.11a

 OFDM PLCP

 OFDM PMD

 Characteristics of the OFDM PHY

14. 802.11g: The Extended-Rate PHY (ERP)

 802.11g Components

 ERP Physical Layer Convergence (PLCP)

 ERP Physical Medium Dependent (PMD) Layer

15. A Peek Ahead at 802.11n: MIMO-OFDM

 Common Features

 WWiSE

 TGnSync

 Comparison and Conclusions

16. 802.11 Hardware

 General Structure of an 802.11 Interface

 Implementation-Specific Behavior

 Reading the Specification Sheet

17. Using 802.11 on Windows

 Windows XP

 Windows 2000

 Windows Computer Authentication

18. 802.11 on the Macintosh

 The AirPort Extreme Card

 802.1X on the AirPort

19. Using 802.11 on Linux

 PCMCIA Support on Linux

 Linux Wireless Extensions and Tools

 Agere (Lucent) Orinoco

 Atheros-Based cards and MADwifi

 802.1X on Linux with xsupplicant

20. Using 802.11 Access Points

 General Functions of an Access Point

 Power over Ethernet (PoE)

 Selecting Access Points

 Cisco 1200 Access Point

 Apple AirPort

21. Logical Wireless Network Architecture

 Evaluating a Logical Architecture

 Topology Examples

 Choosing Your Logical Architecture

22. Security Architecture

 Security Definition and Analysis

 Authentication and Access Control

 Ensuring Secrecy Through Encryption

 Selecting Security Protocols

 Rogue Access Points

23. Site Planning and Project Management

 Project Planning and Requirements

 Network Requirements

 Physical Layer Selection and Design

 Planning Access-Point Placement

 Using Antennas to Tailor Coverage

24. 802.11 Network Analysis

 Network Analyzers

 Ethereal

 802.11 Network Analysis Checklist

 Other Tools

25. 802.11 Performance Tuning

 802.11 Performance Calculations

 Improving Performance

 Tunable 802.11 Parameters

26. Conclusions and Predictions

 Standards Work

 Current Trends in Wireless Networking

 The End

Glossary

Index