When an ACK frame is not received by the transmitting STA, what is assumed?
A.
The receiver processed the frame, but did not respond with an ACK frame because 802.11w is enabled
B.
The frame was correctly delivered
C.
The frame was not delivered and must be retransmitted
D.
The receiver is offline
The Answer Is:
C
This question includes an explanation.
Explanation:
An ACK (Acknowledgement) frame is a short control frame that is sent by the receiver of a data or management frame to confirm that the frame was received correctly. The ACK frame is sent after a SIFS (Short Interframe Space) interval, which is the shortest time gap between frames in 802.11. If the transmitter does not receive an ACK frame within a specified time, it assumes that the frame was not delivered and must be retransmitted. This is part of the 802.11 reliability mechanism that ensures reliable data delivery over an unreliable wireless medium . References: [CWNA-109 Study Guide], Chapter 5: IEEE 802.11 Medium Access, page 209; [CWNA-109Study Guide], Chapter 5: IEEE 802.11 Medium Access, page 203.
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