Discussion
In an Ethernet local area network, which one of the following statements is TRUE?
Answer: D
The true statement is the exponential backoff mechanism reduces the probability of collision on retransmissions.
After a collision, each station waits a random number of slot times chosen from a range that doubles after each successive collision (binary exponential backoff). Spreading the retries over a growing range makes it less likely that the same stations choose the same slot again.
The others describe CSMA/CD wrongly. A station keeps sensing the channel while transmitting; that is how it detects a collision. The jamming signal tells all stations a collision occurred; padding short frames is a separate rule for the minimum frame size. And a station stops transmitting the frame once it detects a collision, after sending the jam signal.
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