Wireless LAN of Computer network

802.11 standard

Wireless LAN often abbreviated as WLAN (Wireless Local area Network).

1997 IEEE developed the Protocol Standard for wireless LANs 802.11 . 802.11 is a fairly complex standard, in short, a wireless Ethernet standard, using a star topology, whose center is called an access point AP , uses the CSMA/CA protocol on the MAC layer.

A LAN that uses the 802.11 series protocol is also known as Wi-Fi (wireless-fidelity, which means "wireless fidelity"). The

802.11 standard specifies that the minimum component of a wireless LAN is basic Service Set BSS (basic services set). A basic service and BSS includes a base station and several mobile stations, all of which can communicate directly within this BSS, but must pass through the base station of this BSS when communicating with stations other than this BSS. The base station in the

BSS is the access point AP, and when the network administrator installs the AP, the AP must be assigned a Service Set identifier SSID of no more than 32 bytes , and a channel.

The geographic extent covered by a BSS is called a basic service area, BSA , which typically does not exceed 100 meters in diameter.

A BSS can be isolated, or it can be connected to a assign System DS (the distribution system) via an access point AP, and then to another BSS, which makes up a Extended Service Set ESS (Extended Service Set). ESS can also provide wireless users access to non-802.x (non-802.11 wlan). This access is implemented through the portal. The role of the portal is equivalent to a bridge.

 

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Wireless LAN of Computer network