802.11:Channels,association 802.11b:2.4GHz-2.485GHz spectrum divided into 11 channels at different frequencies o AP admin chooses frequency for AP o interference possible:channel can be same as that chosen by neighboring AP! host:must associate with an AP o scans channels,listening for beacon frames containing AP's name(SSID)and MAC address o selects AP to associate with o may perform authentication [Chapter 8] o will typically run DHCP to get IP address in AP's subnet 6:Wireless and Mobile Networks 6-186: Wireless and Mobile Networks 6-18 802.11: Channels, association  802.11b: 2.4GHz-2.485GHz spectrum divided into 11 channels at different frequencies  AP admin chooses frequency for AP  interference possible: channel can be same as that chosen by neighboring AP!  host: must associate with an AP  scans channels, listening for beacon frames containing AP’s name (SSID) and MAC address  selects AP to associate with  may perform authentication [Chapter 8]  will typically run DHCP to get IP address in AP’s subnet