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End-to-end message transport:(

[问答题]
End-to-end message transport:(a) without message segmentation;(b) with message segmentation.
a. Consider sending the message from source to destination without message segmentation. How long does it take to move the message from the source
host to the first packet switch? Keeping in mind that each switch uses store-and-forward packet switching, what is the total time to move the message from source host to destination host?
b. How long does it take to move the file from source host to destination host when message segmentation is used? Compare this result with your answer in part(a) and comment.
c. Now suppose that the message is segmented into 5,000 packets, with each packet being 1, 500 bits long. How long does it take to move the first packet from source host to the first switch? when the first packet is being sent from the first switch to the second switch, the second packet is being sent from the source host to the first switch. at what time will the second packet be fully received at the first switch?
d. Discuss the drawbacks of message segmentation.

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