Question: Suppose the propagation delay is , SIFS is , DIFS is 3, and RTS and CTS are 5, respectively, for CSMA/CA with RTS/CTS. (a) What

Suppose the propagation delay is α, SIFS is α, DIFS is 3α, and RTS and CTS are 5α, respectively, for CSMA/CA with RTS/CTS.
(a) What is the earliest time for the receiver to send the CTS message?
(b) If the data packet is 100α long, what is the shortest time for the receiver to send the ACK signal?
(c) Explain why SIFS is kept smaller than DIFS.
(d) Can you make SIFS = 0?

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