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Unit 9 · Data Communication and Computer Networks Paper 2 CS · 22 June 2026

Choose the right sequence of stages for data transmission using CSMA/CD.
A. If the channel is clear, the sender sends the data.
B. The sender senses the channel for activity.
C. The sender waits for a random back off time before retransmitting.
D. Collision detection occurs if two devices transmit at the same time.
Choose the correct answer from the options given below :

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Correct answer: B. B, A, D, C

Explanation

In CSMA/CD (Carrier Sense Multiple Access with Collision Detection), the sender first senses the channel for activity (B); if the channel is found clear, it proceeds to send its data (A). While transmitting, the sender keeps monitoring the line, and collision detection occurs if two devices happen to transmit at the same time (D). On detecting a collision, the sender aborts the transmission and waits for a random back-off time before retransmitting (C), giving the correct order B, A, D, C.

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