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Suppose TCP is used over a lossy link that loses on average one segment in four. Assume the delay x bandwidth window size is considerably larger than four segments. (a) What happens when we start a connection? Do we ever get to the linear-increase phase of congestion avoidance? (b) Without using an explicit feedback mechanism from the routers, would TCP have any way to distinguish such link losses from congestion losses, at least over the short term? (c) Suppose TCP senders did reliably get explicit congestion indications from routers. Assuming links as above were common, would it be feasible to support window sizes much larger than four segments? What would TCP have to do?

Suppose TCP is used over a lossy link that loses on average one segment in four. Assume the delay x bandwidth window size is considerably larger than four segments. (a) What happens when we start a connection? Do we ever get to the linear-increase phase of congestion avoidance? (b) Without using an explicit feedback mechanism from the routers, would TCP have any way to distinguish such link losses from congestion losses, at least over the short term? (c) Suppose TCP senders did reliably get explicit congestion indications from routers. Assuming links as above were common, would it be feasible to support window sizes much larger than four segments? What would TCP have to do?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Suppose TCP is used over a lossy link that loses on average one segment in four. Assume the delay x bandwidth window size is considerably larger than four segments. (a) What happens when we start a connection? Do we ever get to the linear-increase phase of congestion avoidance? (b) Without using an explicit feedback mechanism from the routers, would TCP have any way to distinguish such link losses from congestion losses, at least over the short term? (c) Suppose TCP senders did reliably get explicit congestion indications from routers. Assuming links as above were common, would it be feasible to support window sizes much larger than four segments? What would TCP have to do?
Transcribed Image Text:Suppose TCP is used over a lossy link that loses on average one segment in four. Assume the delay x bandwidth window size is considerably larger than four segments. (a) What happens when we start a connection? Do we ever get to the linear-increase phase of congestion avoidance? (b) Without using an explicit feedback mechanism from the routers, would TCP have any way to distinguish such link losses from congestion losses, at least over the short term? (c) Suppose TCP senders did reliably get explicit congestion indications from routers. Assuming links as above were common, would it be feasible to support window sizes much larger than four segments? What would TCP have to do?
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