无线局域网基本原理及技术
无线局域网基本原理及技术.............................................................................................................1
议程.............................................................................................................................................2
1. 无线局域网的概念.........................................................................................................................2
2. 无线局域网的标准.........................................................................................................................2
3. 无线局域网的技术.........................................................................................................................2
1. 无线网络的概念.....................................................................................................................2
无线数据网分类.................................................................................................................2
无线局域网和有线局域网的对比.....................................................................................3
无线网络优点.....................................................................................................................3
无线电频谱范围.................................................................................................................4
什么是 ISM.........................................................................................................................4
信道分配.............................................................................................................................5
2. 无线局域网标准.....................................................................................................................5
IEEE 802.11 的无线局域网标准.......................................................................................6
802.11 标准组.....................................................................................................................7
无线局域网模型.................................................................................................................7
802.11 物理层.....................................................................................................................8
802.11 物理层示意图.........................................................................................................8
调制技术.............................................................................................................................9
什么是展频.........................................................................................................................9
跳频技术 FHSS..................................................................................................................9
3.无线局域网基本技术............................................................................................................11
无线局域网基本构架.......................................................................................................12
IBSS...................................................................................................................................12
BSS....................................................................................................................................13
ESS....................................................................................................................................14
Distribution System...........................................................................................................16
ESSID................................................................................................................................16
Authentication...................................................................................................................16
CSMA/CA 协议................................................................................................................17
冲突检测...........................................................................................................................17
漫游(Roaming).................................................................................................................18
漫游(Roaming).................................................................................................................18
漫游(Roaming)............................................................................................................19
漫游的移交过程...............................................................................................................19
负载均衡...........................................................................................................................19
有线等效加密(WEP)..................................................................................................20