Multiple choice

When a collision occurs in a network using CSMA/CD, how do hosts with data to transmit respond after the backoff period has expired?

  1. The hosts return to a listen-before-transmit mode.

  2. The hosts creating the collision have priority to send data.

  3. The hosts creating the collision retransmit the last 16 frames.

  4. The hosts extend their delay period to allow for rapid transmission.
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A Correct answer
Explanation

In CSMA/CD (Carrier Sense Multiple Access with Collision Detection), when a collision occurs, both devices stop transmitting and wait a random backoff period. Once this backoff expires, the hosts do not immediately retransmit. Instead, they return to a listen-before-transmit mode, meaning they sense the carrier to ensure the medium is idle before attempting to transmit again. This prevents repeated collisions.

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