October 2003
Intermediate to advanced
368 pages
9h 48m
English
Content preview from Field Guide to Wireless LANs for Administrators and Power Users, ABecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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What Causes a Probe Response?
The simple answer is that a Probe Request MMPDU does. Under what circumstances is such a frame sent?
A STA seeking to join a WLAN has a choice between listening on successive channels, waiting on each channel to hear a Beacon from an AP (this is known as a passive scan), or performing an “active scan” of the network, in which the STA transmits Probe Request MMPDUs on all available channels until the STA finds an AP, a timer expires and the user gives up, or until the device's battery runs out.
One disadvantage of a passive scan is that the STA does not know a priori which channel(s) are in use in a given physical location, so it must listen for a potential Beacon on each channel for some amount of time before moving ...
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