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Wednesday, January 10, 2018

Computer Networks 2016(1)




In an Ethernet local area network, which one of the following statements is TRUE?
  1. A station stops to sense the channel once it starts transmitting a frame.
  2. The purpose of the jamming signal is to pad the frames that are smaller than the minimum frame size.
  3. A station continues to transmit the packet even after the collision is detected.
  4. The exponential back off mechanism reduces the probability of collision on retransmissions.


Ans: The exponential backoff mechanism reduces the probability of collision on retransmissions.
(Binary) exponential backoff refers to a collision resolution mechanism used in random access MAC protocols. This algorithm is used in Ethernet (IEEE 802.3) wired LANs. In Ethernet networks, this algorithm is commonly used to schedule retransmissions after collisions.

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