Question: (7) IEEE 802.11 defines its physical and MAC layers based on CSMA/CA. Answer the [12] following questions on CSMA/CA. (a) Identify and briefly explain three

(7) IEEE 802.11 defines its physical and MAC layers based on

(7) IEEE 802.11 defines its physical and MAC layers based on CSMA/CA. Answer the [12] following questions on CSMA/CA. (a) Identify and briefly explain three reasons why CSMA/CD cannot be used for a wireless 6 LAN? (b) Explain the purpose of the SIFS, PIFS, DIFS intervals. Rank these timers in terms of 6 their relative durations

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