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Mr. Dubey • 52.26K Points
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Q. Which of the following is the multiple access protocol for channel access control?

(A) csma/cd
(B) csma/ca
(C) both csma/cd & csma/ca
(D) hdlc
Correct : Option (C)

Explanation: 
 in csma/cd, it deals with detection of collision after collision has occurred, whereas csma/ca deals with preventing collision. csma/cd is abbreviation for carrier sensing multiple access/collision detection. csma/ca is abbreviation for carrier sensing multiple access/collision avoidance. these protocols are used for efficient multiple channel access.

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