GATE CS 2016 Set 2 — Question 34
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Computer Networks → Medium Access & LANs → CSMA/CD
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Question
In an Ethernet local area network, which one of the following statements is TRUE?
Correct answer
(D) The exponential backoff mechanism reduces the probability of collision on retransmissions.
Solution
In CSMA/CD (Carrier Sense Multiple Access with Collision Detection):
- A station must listen to the channel while transmitting to detect collisions. If it stops sensing, it cannot detect collisions. Thus, (A) is false.
- The jamming signal is a short signal sent by a station that detects a collision to ensure that all other stations on the network are aware of the collision and discard the frame. Padding is used to extend a frame to the minimum size (64 bytes) before transmission, not by the jamming signal. Thus, (B) is false.
- When a collision is detected, the station immediately stops transmitting the data packet and sends the jamming signal. It does not continue transmitting the packet. Thus, (C) is false.
- The binary exponential backoff algorithm is used to schedule retransmissions after a collision. It chooses a random backoff time from an interval that doubles in size with each consecutive collision ( to ). This spreads out the retransmission attempts of colliding stations, reducing the probability of another collision. Thus, (D) is true.
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