Why are link-layer ACKs used in WiFi (802.11) networks?

Question

Accepted Answer

Wireless links are noisier than wired links, and so bit level errors are more likely to occur, making link-layer error recovery more valuable that in less-noisy wired links.

Accepted Answer

Because of the hidden terminal problem, a node that is transmitting and hears no collisions still doesn't know if there was a collision at the receiver.

Answer

Hearing a receiver ACK, all other stations will stop transmitting.  This reduces collisions.

Answer

The sender can used the differences in the signal strength in an ACK to infer whether the receiver is moving towards, or away from, the sender

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Why are link-layer ACKs used in WiFi (802.11) networks?

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