GATE 2024 CS (CS2) – Question 55
Consider an Ethernet segment with a transmission speed of $10^8$ bits/sec and a maximum segment length of 500 meters. If the speed of propagation of the signal in the medium is $2\times10^8$ meters/sec, then the minimum frame size (in bits) required for collision detection is _________
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Correct answer: 500
Explanation
Propagation delay = 500/(2×10^8) = 2.5 µs. Frame transmission time must be at least 2 × 2.5 = 5 µs, so size = 5×10^-6 × 10^8 = 500 bits.