Siemens IEEE802.11 Manual do Utilizador descarregar pdf (Página 63)

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 63 © Siemens, 2002

Summary: MAC Functionality

n Independent and Infrastructure configuration support

– Each BSS has a unique 48 bit address

– Each ESS has a variable length address

n CSMA with collision avoidance

– MAC-level acknowledgment

– allows for RTS/CTS exchanges (hidden node protection)

– MSDU fragmentation

– “Point Coordination” option (AP polling)

n Association and Reassociation

– station scans for APs, association handshakes

– Roaming support within an ESS

n Power management support

– stations may power themselves down

– AP buffering, distributed approach for IBSS

n Authentication and privacy

– Optional support of “Wired Equivalent Privacy” (WEP)

– Authentication handshakes defined

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Siemens IEEE802.11 Manual do Utilizador Página 63