A Client Scans for APs
To join a BSS, a wireless device first has to scan its surroundings to look for any live APs that might offer network service. Beyond that, the device might need to build a list of SSIDs that are available. A device can scan the wireless horizon in two ways:
Passive scan—The device simply listens for any beacon frames broadcast from nearby APs. Passive scanning has a couple of drawbacks—a device must wait until beacons are broadcast at the next interval, which might not be soon enough in a time critical situation; beacons ...
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