GATE 2015 CS (CS3) – Question 35

Computer Networks · Data Link Layer: Error Detection, Medium Access Control, Flow Control · 1 mark · Multiple choice

A CSMA/CD network transmits at 100 Mbps over a 1 km cable without repeaters. Minimum frame size is 1250 bytes. Find the signal speed in km/s.

8000
10000
16000
20000

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Show answer and explanation

Correct answer: (D) 20000

Explanation

A minimum frame takes 1250×8/10⁸ seconds=100 microseconds to transmit. Collision detection requires that this cover the round-trip propagation delay, so one-way delay is fifty microseconds at the minimum. Speed is 1 km/(50×10⁻⁶ s)=20000 km/s, D.

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