More on the APs and NICs
3 separate channels available for 802.11b
- All devices using an AP must use the same channel
- WLAN functions as a shared media LAN
- Reduces the interference
- Users can roam from AP to AP
- Initially NIC selects a channel (thus an AP)
- Based on “strength of signal” from an AP
- During roaming, if NIC sees another AP with a stronger signal, attaches itself to this AP
Usually a set of APs installed to provide geographical coverage and meet traffic needs
- NICs selects a less busy channel if its current channel becomes busy (too many users)