Project ForgeComputer Networks
OSI/TCP-IP Layers & Routing
GATE 2016
Hard
A network has a data transmission bandwidth of 20×10⁶ bits per second. It uses CSMA/CD in the MAC layer. The maximum signal propagation time from one node to another node is 40 microseconds. The minimum size of a frame in the network is ____ bytes.
200
Explanation
For collision detection to work, the transmission time must be at least the round-trip propagation delay: Tt ≥ 2×40μs = 80μs. Minimum frame size = 80×10⁻⁶s × 20×10⁶ bps = 1600 bits = 200 bytes.
Source: GATE CS 2016 (Session 2 / Set B) (2016)
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