October 2012
Intermediate to advanced
160 pages
2h 49m
Chinese
Content preview from 802.11n技術手冊
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
第八章
設計與建置一個 802.11n 網路
當規劃完成後，該是深入至網路設計的細節了。一旦你對你的網路必須支援的服務充分
瞭解，你將能夠透過明確的專案規劃來進行建置。從瞭解如何使用無線鏈結去擴展網路
的存取層，接著選用適當的產品。在透過基本的網路監控確保該網路可以滿足需求後，
接下來才進行實體上的安裝。
802.11n 的網路架構
在整個無線區域網路技術的演進上，已經有許多方法可以將無線區域網路存取層增加到
現有的有線骨幹網路上，大部分的方法都有兩個基礎屬性：
MAC
層的移動性
（也稱作 OSI 模型之「第二層」移動性）。802.11 從骨幹網路藉著「隱
藏」設備的動作來進行作業，即使無線區域網路的設備在空間中移動，從路由器與交換
器的角度來看，他們仍然在相同的廣播網段邊界之內。在一個單一廣播網段，移動性
是很容易的。十年前，難以提供連續的連結性以跨越一個路由（第三層）界線，但是現
在每個市售適用於大規模網路環境的產品，已經解決了「子網漫遊」的問題。無線產品
在 MAC 層提供這類能力－如同 802.11 設備有能力在周圍移動，不管它從何處連結到網
路，它仍然會持續發送訊框至它的預設閘道。
1
1 MAC 層移動性的替代方案是行動 IP 協定，它嵌入移動性功能到網路層（OSI 模型第三層）。行動 IP 沒
有被廣泛使用，大部分是因為要廣泛修改終端使用者設備及網路邊界設備的 TCP/IP 堆疊。
102
|
第八章
802.1X
安全性
（Wi-Fi 聯盟認證之後也稱為「WAP2-Enterprise」或「第二層安全性」 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.