Question: 13. Why ACK frame's duration field might contain a none zero value? 14. What is the Deferred Beason? what issues may be caused by deferred
13. Why ACK frame's duration field might contain a none zero value? 14. What is the "Deferred Beason"? what issues may be caused by deferred beacon? 15. Please describe briefly the interoperability issue in WLAN? Why backward compatibility is commonly implemented in WLAN? 16. What are the four steps used in authentication with shared key? What are potential security issues in one-way authentication? 17. In the ATIM window, the ACK frame is expected for unicast frames, but not expected for multicast frames, why
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