Question

In the standard Ethernet, if the maximum propagation time is 25.6 µs, then the minimum size of the frame is

• A. 64 bytes
• B. 512 bytes
• C. 48 bytes
• D. 6 bytes

Hint:

In Ethernet, the minimum frame size of 64 bytes ensures that a sender can detect any collisions before it finishes sending the frame.

Answer 1

The Correct Option is A

The minimum frame size in Ethernet is determined by the round-trip propagation time, as the sender must transmit enough data so that the frame can still be transmitted while waiting for any possible collision to be detected.
In standard Ethernet (10 Mbps), the frame must be long enough so that it is still being transmitted when the signal reaches the farthest end of the network. The minimum size of the Ethernet frame is 64 bytes, which accounts for the maximum round-trip propagation time and ensures that collisions can be detected.
Given the maximum propagation time of 25.6 µs, the minimum frame size is calculated to be 64 bytes.
Therefore, the correct answer is 1. 64 bytes.