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Wednesday, January 10, 2018

Computer Networks 2016(4)

For the IEEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE?

I. At least three non-overlapping channels are available for transmissions.
II. The RTS-CTS mechanism is used for collision detection.
III. Unicast frames are ACKed.

(A) All I, II, and III
(B) I and III only
(C) II and III only
(D) II only

Answer : (B)

 Explaination :

RTS/CTS (Request to Send / Clear to Send) is the optional mechanism used by the 802.11 wireless networking protocol to reduce frame collisions introduced by the hidden node problem. That is, RTS/CTS mechanism is used to avoid the collision not for collision detection.

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