Which of the following statements is TRUE about CSMA/CD
(A) IEEE 802.11 wireless LAN runs CSMA/CD protocol
(B) Ethernet is not based on CSMA/CD protocol
(C) CSMA/CD is not suitable for a high propagation delay network like satellite network
(D) There is no contention in a CSMA/CD network
Answer: (C)
Explanation: CSMA/CD requires that sender should be transmitting at least till the first bit reaches the receiver, so it can detect collision if any. For Networks with high prorogation delay this time becomes too long hence the minimum packet size required becomes too big to be feasible.
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