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Question:

What is a possible source of this issue:
A new wireless client is set up to connect to an 802.11 network. This client use the same hardware and software as many of the other network clients. The client can see the network but is unable to connect to it. A wireless packet sniffer reveals that the Wireless Access Point (WAP) is not responding to the wireless client's association requests.

A The WAP does not recognize the client's MAC address
Explaination