GATE 2013 CS (CS1) – Question 46

Computer Networks · Data Link Layer: Error Detection, Medium Access Control, Flow Control · 2 marks · Multiple choice

An Ethernet LAN sends 10000-bit frames at 500 Mb/s. Signals travel at 200000 km/s. Find maximum cable length in km for collision detection.

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Correct answer: (B) 2

Explanation

Frame transmission time is 10000/(500×10⁶)=20 μs. Collision detection requires round-trip propagation no larger than this, so one-way propagation is at most 10 μs. Maximum length is 200000×10⁻⁵=2 km, B.

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