802.11ac无线网络生存指南

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"802.11ac A Survival Guide" 是一本由 Matthew S. Gast 编写的关于无线网络技术的专业指南，主要聚焦于802.11ac标准，该标准是Wi-Fi联盟对高速无线局域网（WLAN）的一个重要更新。这本书可能包含了深入的技术细节、实施策略以及解决802.11ac相关问题的方法。 802.11ac标准是802.11家族中的一个成员，旨在提供比802.11n更高的数据传输速率。它通过采用更宽的无线频道（例如80MHz或160MHz）、多输入多输出（MIMO）技术的增强以及更高阶的调制（如256-QAM）来实现这一目标。这使得802.11ac在理想条件下可以达到千兆比特每秒（Gbps）的传输速度，显著提升了家庭、办公室和公共Wi-Fi热点的性能。书中的内容可能涵盖以下几个方面： 1. **802.11ac技术基础**：介绍802.11ac的基本原理，包括频道带宽、调制方式和MIMO技术的工作原理。 2. **网络架构**：详细阐述802.11ac在无线接入点（AP）和客户端设备之间的部署，以及如何优化网络架构以提升性能。 3. **频谱管理**：探讨如何有效地管理无线频谱，避免干扰并提高信道利用率。 4. **安全性和加密**：讨论802.11ac网络的安全措施，包括WPA2等加密协议的使用。 5. **性能测试与优化**：提供测试网络性能的方法，以及在遇到性能问题时的诊断和优化策略。 6. **实施与配置**：指导读者如何正确配置802.11ac设备，确保最佳性能。 7. **未来发展趋势**：分析802.11ac之后的Wi-Fi标准，如802.11ax（也称为Wi-Fi 6），及其对无线网络的影响。 8. **案例研究**：可能包含实际应用中的成功案例，展示802.11ac在不同环境下的表现。这本书对于IT专业人士、网络管理员、系统集成商以及对无线网络技术感兴趣的读者来说，是一本宝贵的参考书籍。它不仅提供了理论知识，还提供了实践中的实用技巧，帮助读者理解和应对802.11ac技术带来的挑战。由于802.11ac已成为现代无线网络的主流标准，因此这本书对于确保网络的高效运行和优化至关重要。

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Acknowledgments

This is my second book written with Meg Blanchette as editor. Meg kept the book

moving along as best she could, which is no small feat given that I successfully pursued

a pilot cetificate as I wrote this book. Meg regularly sought out opportunities for me to

experiment as an author, most notably by encouraging me to participate in the early

release program starting six months before the book’s final release. All the delays in

publication are due entirely to my preoccupation with aviation, and would no doubt

have been much worse without Meg’s diligent efforts to keep me on track.

I could not have asked for better readers to keep me motivated. As a direct result of all

the notes and questions that I received, the book grew substantially during the review

cycle. The review team included several 802.11 luminaries who are famous in their own

right. My all-star review team consisted of (in alphabetical order, so I do not need to try

and rank their many valuable and varied contributions in any sort of order):

Joe Fraher

Joe is a technical writer and colleague of mine at Aerohive, where he consistently

produces documentation that is lucid, complete, and easy to use. Unlike me, he has

mastered all the tools of his trade and handles the whole project from start to finish.

One of Joe’s main contributions to the finished product you now hold is that he

does not let me get away with glossing over anything. If you find that the book is

consistent and complete, your thanks are properly given to Joe.

Changming Liu

Changming is the CTO at Aerohive, and a fountain of ideas both for Aerohive’s

customers, and for me personally. I cannot name a conversation with him that I did

not wish were longer.

Chris Lyttle

Chris heads up the wireless LAN practice at a major integrator, where he helps

customers figure out how to use the technology that we build as an industry. Along

the way, he chronicles the journey on his blog at Wi-Fi Kiwi, sharing valuable bits

of information with anybody who is trying to run a wireless LAN.

xiv | Preface

2. Matthew also wrote the nicest thing I’ve ever read about my writing on his own blog at http://www.insearch

oftech.com/2013/04/11/the-curse-of-matthews-books/.

3. Adrian is English, so I deviate from the American spelling just to show him that I can be bilingual.

Craig Mathias

At the Farpoint Group, Craig has been a prolific writer on 802.11 for many years.

I am indebted to him for his many kind words over the years, and the encourage‐

ment he has always given me to continue writing on 802.11. Craig has asked me to

be on many panels at industry events over the years, and has never failed to promote

my books in his thoughtful introductions. As an analyst on the cutting edge, Craig

is able to talk about new developments throughout the development process.

Matthew Norwood

Matthew, a senior technologist at an integrator, is one of the many people in the

industry who has to do useful things with the crazy collection of technology parts

we create. His networking mad science, which is about many components in ad‐

dition to wireless LANs, unfolds at In Search of Tech.

Matthew brought the sen‐

sibility of an expert network engineer to the book, and his review of the planning

and integration parts of this book was particularly valuable.

Adrian Stephens

Adrian is one of the leaders of the 802.11 working group, where he has consistently

used computers to save work instead of creating more of it. Talking to Adrian is

like dropping questions into a deep well of technical knowledge. (For the record, I

have yet to find the bottom.) I benefited from Adrian’s prodigious knowledge when

we worked together on the 802.11-2012 revision, and he continues to serve the

802.11 community in ways too numerous to count. His comments on advanced

MAC features and beamforming particularly strengthened the text, and his

humourous

comments added levity to the long slog of finishing the book, the effect

of which was to help me see the light at the end of the tunnel.

Tim Zimmerman

Tim is an analyst with a technology advisory firm, and one of the most plugged-in

people in the Wi-Fi industry. I am grateful for his time, and his many comments

expanded multiple parts of the book in ways that will benefit you.

Preface | xv

In addition to the formal review team, I benefited from the assistance of many other

readers. Early release readers came from all across the world. Some of the most helpful

were:

Jeff Haydel

Jeff is a talented field engineer for Aerohive, and was all that an author could ask

for in an early release reader. He religiously read multiple drafts of the book, and

was particularly helpful in striking the right balance between remaining faithful to

the specification while trying to be concise and comprehensible.

Colleen Szymanik

Colleen Szymanik runs one of the largest and most complex wireless networks in

the world, and her comments kept me focused on how to keep the book focused

on information that would help working network administrators everywhere.

Ben Wilson

My colleague Ben Wilson has helped deploy more wireless networks than I care to

count. His work takes him all across the UK, and I cannot figure out how he found

time to review the book, let alone offer numerous useful suggestions.

One of the advantages of publishing the book early was that readers were able to interact

with each other, both in person and on blogs. As I was working on incorporating tech‐

nical review comments, I finally met Lee Badman face-to-face at Interop, and our brief

discussion was critical to refining my thinking about the connectivity that will support

future generations of 802.11ac access points.

I am grateful to readers who served as valuable sanity checks during the writing process,

and helped keep me as focused as possible on the end goal. Terry Simons, who works

on wireless LAN integration for Nest Labs, found the time to review the draft of this

book and give me the detailed technical feedback of somebody who knows what it takes

to make Wi-Fi just work. Tom Hollingsworth offered encouragement at a critical junc‐

ture. Michele Chubirka, the security podcaster for Packet Pushers, provided a much-

welcomed reality check during the middle of the long twilight of the book. Kelly Davis-

Felner and Bill Solominsky at the Wi-Fi Alliance offered encouragement both in person

at the Wi-Fi Alliance meeting where much of this book was written, and by drafting me

into writing for the Wi-Fi Alliance on 802.11ac.

xvi | Preface

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