GATE | GATE-CS-2016 (Set 2) | Question 34

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


Answer: (D)

Explanation:  

An Ethernet is the most popularly and widely used LAN network for data transmission.
It is a protocol of data link layer and it tells how the data can be formatted to transmit and how to place the data on network for transmission.

Now considering the Ethernet protocol we will discuss all the options one by one

(A) This option is false as in Ethernet the station is not required to stop to sense for the channel prior frame transmission.
(B) A signal is jammed to inform all the other devices or stations about collision that has occurred so that further data transmission is stopped. Thus this option is also false
(C) Once the collision has occurred the data transmission is stopped as the jam signal is sent. Thus this option is also incorrect.
(D) To reduce the probability of collision on retransmissions an exponential back off mechanism is used. Thus, only this option is true.
This solution is contributed by Namita Singh.

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