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
Answer» C. both csma/cd & csma/ca
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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