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What are the two frames used in active scanning?
Active scanning uses the transmission of Probe Request frames to identify networks in the area. Passive scanning saves battery power by listening for Beacon frames.
What is the difference between association frames and reassociation frames?
association frames are management frames, whereas reassociation frames are control frames. Reassociation frames are used during the roaming process. The reassociation frame contains an additional field called the Current AP Address. This address is the BSSID of the original AP that the client is leaving.
Which device is responsible for sending beacon frames in 802.11 Wlans?
Infrastructure network access points send beacons at a defined interval, which is often set to a default 100 TU which is equivalent to 102.4 ms. In the case of an ad hoc network where there are no access points, a peer station is responsible for sending the beacon.
What are probe frames?
The WLAN clients or stations use probe request frame to scan the area for availability of WLAN network. In order to have successful probe requests, stations transmitting them should have rates supported by the network which they wish to join. Hence SSID of the network should be included in the probe request frame.
Which is included in the probe request frame?
In order to have successful probe requests, stations transmitting them should have rates supported by the network which they wish to join. Hence SSID of the network should be included in the probe request frame. In response to the received probe request, network sends out probe response frame when parameters are compatible.
When to include SSID in probe request frame?
Hence SSID of the network should be included in the probe request frame. In response to the received probe request, network sends out probe response frame when parameters are compatible. Fig-2 mentions all the fields carried by WLAN probe response frame.
What does a probe response frame do in 802.11?
Probe response frame: In response to the probe request, APS with matching criteria will respond with a probe response frame containing synchronization information and access point load and would contain capability information, supported data rates, etc. 802.11 control frames assist in the delivery of data frames between stations.
What should be included in a probe response?
The probe response contain the Requested Information elements that may have been requested by the probing station. Here is the complete list of field that can be in the frame body of a Probe Response frame.