Given below are two statements: one is labelled as Assertion A and the other…

2026

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: 1-persistent CSMA provides low delay under low load conditions.

Reason R: When the channel is free, stations transmits immediately without any random delay, ensuring quick access and minimal delay.

In the light of the above statements, choose the most appropriate answer from the options given below:

  1. Both A and R are correct and R is the correct explanation of A

  2. Both A and R are correct but R is NOT the correct explanation of A

  3. A is correct but R is not correct

  4. A is not correct but R is correct

  1. A.

    1

  2. B.

    2

  3. C.

    3

  4. D.

    4

Attempted by 227 students.

Show answer & explanation

Correct answer: A

Analysis of 1-Persistent CSMA

1-Persistent Carrier Sense Multiple Access (CSMA) is a medium access control protocol where a station listens to the channel before transmitting.

If the channel is busy, the station waits until it becomes free. Once free, it transmits immediately with probability 1, without any random backoff delay.

Evaluating the Statements

Assertion A states that 1-persistent CSMA provides low delay under low load conditions. This is accurate because low load means the channel is rarely busy, allowing immediate transmission.

Reason R states that when the channel is free, stations transmit immediately without random delay. This is also accurate and describes the core mechanism of 1-persistent CSMA.

Since the immediate transmission described in Reason R is the direct cause of the low delay mentioned in Assertion A, Reason R correctly explains Assertion A.

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