GATE | Gate IT 2008 | Question 63

The minimum frame size required for a CSMA/CD based computer network running at 1 Gbps on a 200m cable with a link speed of 2 × 10⁸m/s is (A) 125 bytes (B) 250 bytes (C) 500 bytes (D) None of these
Answer:(B)
Explanation: For the CSMA/CD protocol to work, the transmission time of the frame must be more than a minimum value. This minimum value is the worst case Round trip Time. Therefore, Transmission Time >= RTT Let the frame size be bytes. The minimum frame size is 250 bytes Therefore option (B) is correct. This explanation is provided by Chirag Manwani.
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