When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?
For each probe request frame, only one AP may reply with a probe response.
Each AP responds in turn after preparing a probe response and winning contention.
Each AP checks with the DHCP server to see if it can respond and then acts accordingly.
After waiting a SIFS, all APs reply at the same time with a probe response.
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