??????????Wireless Local Area Network

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??????????Wireless Local Area Network

• ???
• ??????
• 2006-12-07

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????

• ??????????
• ?????????????
• ??????????
• ????????
• ????????

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??????

• ???InfraRed(?????)
• ??(Bluetooth)(?????802.15)
• 802.15.3a WPAN Ad hoc 220Mbps
• WLAN (?????802.11)
• WiMAX (?????802.16)
• WWAN (??????) (3G??2008????)

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??????????

• Anytime
• Anyplace (wireless)
• Anyone
• Anything (text,audio,video)

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WLAN?????IEEE 802.11

• 1990???IEEE 802.11??????????,???????2.4
  GHz????????????????????
• 1999?9?IEEE 802.11b??????IEEE 802.11b????????,????
  ?????????1?2?5.5?11 Mbit/s???????????

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IEEE 802.11a IEEE 802.11g

• (3)IEEE 802.11a
• 802.11a???5.158.825 GHz??,?????????54 Mbit/s?
• (4)IEEE 802.11g
• 2001?11?,IEEE 802???????????802.11g?????????????
  2.4 GHz????11 Mbit/s??????,??????5 GHz????54
  Mbit/s??????.

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????????

• ??????
• ???????????

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WLAN???(????)

• 1. ??????(SSID)??
• ?AP?????SSID,????????????SSID????AP,????????????
  ????,????????????

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WLAN???

• 2. ??????(WEP)
• ??????????802.11?????,?????????????????WEP??40??
  ?,??RSA???RC4??????,?????????WEP???????????,??????
  ??????????????

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WLAN???

• 3. ????(MAC)??
• ?????????????????????,?????????????AP????????MAC
  ????,??AP????,???????AP???????MAC????,???AP???????
  MAC?????Radius?????????MAC??????????,??????

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WLAN?????

• Infrastructure(??????)
• Ad-hoc(??????,???????)

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????
?2-25 ????? ?2-26
?????
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????????

• ?????(???,????)???
• ???(????)???

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???????(??)

• PCI
• USB
• PCMCIA

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???????
?????????????????????SSID??????????AP??,?????????
?????
?2-36 ????
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???????-SSID
???????SSID????,???AP??????,BSS??????????????(Infr
astructure),??2-37???
?2-37 SSID?BSS????
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???????-??

• ?????????????????????,??????????,???AP?????????,??
  2-38???

?2-38 ????
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???????AP

• ?2-39???????????????????,????????????

?2-39 ??????
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???????

• ??????AP?????,????????,??????,??????2-40??,?????
  ??????22Mbps,???6,????????????

?2-40 ????
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??????????

• ??????????????

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????????

• ?????????????Fat AP,???AP????????,?????????
• ????????????????,??????????????
• ????????????????Thin AP???,??????????????????

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?AP?????

• FAT AP????????,???????????????AP?,???????,Radius?
  ??????? (secret) ?????AP????????????,????????????
  ??(?????????,???????????)
• THIN IP??????,?????Wireless switching????????????
  ?,????????????????,AP??????????????????????,??AP??
  ??IP????????????????????,AP??????????????????AP???
  ????????????????????????,????????????????AP???????
  ?????AP???????????,????????THIN AP?

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• ????????AP????AP????,????????
• ??Wireless switching??????????,??????????,???????
  ????????,??????????AP?????

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Aruba???????????

• ??Wireless switching??,Aruba Networks???????????
  ?
• Aruba????????????,AP???????AP?????????????,?????
  ?????????????????????????Aruba AP???,?????Aruba???
  ????GRE????????????????,???????????????????,?????
  ????????????????????????AP??????

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• ?Aruba??????????,AP????DHCP?????IP???IP?????Aruba
  Master IP????????????Aruba AP?????IP???IP?????Arub
  a Master IP???Location ID(Location ID????Aruba
  AP????????,??Aruba AP??????????????Location
  ID?)?????????Aruba????,????????????Aruba
  AP??????,????Location ID??????

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• ?AP???,??????Aruba Master???,???????????????,???
  ??????AP??Aruba??????GRE???????,?GRE??????,Aruba??
  ???AP???????????AP??
• Aruba AP????????????,?????????????????AP???????,
  Aruba??????????????AP?,??AP??????,AP??????????????
  ????

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• Aruba??Dominic Orr???Aruba??????????WLAN???,??????
  ??????????
• ??????????,?????Aruba???????????????

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??

• ??????,????Aruba 6000,?????????????????????????
• ?AP????????????Aruba??AP?????????,?????????????Aru
  ba WLAN??????,??????,????????AP??????????

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• ????FIT???????,?Aruba?Wireless switching??????????
  ?????(FIT)?????????
• ??????FIT???????????,?2006?4?28??FIT????????????
  

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• ??????????????????NETGEAR WG102
  802.11b/g?????AP???NETGEAR??????Aruba???Aruba
  2400 Wi-Fi?????????????????POE???Aruba AirOS???
• NETGEAR?Aruba??????????,??????????????????????????
  ???????Internet????????VoIP????

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• ????Aruba 800Aruba AP 41
• ??,?2008??????,???????????????????????????????(AP)
  ,?IPTV???????????????????????????????Aruba????????
  ???????????

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