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CSMA with Collision Detection

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According to the figure in the attachment,
a. Which node, B or D, first realizes a collision has happened?
b. If B's packet is addressed to A, does A realize that a collision has happened? Explain!
c. What is the jamming signal and who is going to generate it?
d. Draw a graph scenario where a collision does happen, yet only A manages to receive the whole packet.
e. Draw a graph scenario where a collision does not happen altogether.
f. What would happen if the backoff is not exponential? Give an example.

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Solution Summary

The solution includes detailed responses to each of the 6 parts in the question, including clearly labeled graphs for (d) and (e).