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We've learned in class about end-to-end and network-assisted congestion control. A third type of congestion control (mostly deployed only in internal data-center networks) is hop-by-hop congestion control. In this approach a downstream router/host explicitly informs the previous hop upstream router/host about the amount of free buffer space it has available, and the upstream router will only forward a packet when it knows the downstream router has buffer space. A. Consider the three-hop scenario shown below, where the first and third links have capacity R, and the link between the routers has capacity R/2. What is the maximum throughput of the red connection, given that the red and blue connections are similarly controlled, and therefore have the same maximum throughput*?

We've learned in class about end-to-end and network-assisted congestion control. A third type of congestion control (mostly deployed only in internal data-center networks) is hop-by-hop congestion control. In this approach a downstream router/host explicitly informs the previous hop upstream router/host about the amount of free buffer space it has available, and the upstream router will only forward a packet when it knows the downstream router has buffer space. A. Consider the three-hop scenario shown below, where the first and third links have capacity R, and the link between the routers has capacity R/2. What is the maximum throughput of the red connection, given that the red and blue connections are similarly controlled, and therefore have the same maximum throughput*?

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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Question 5 We've learned in class about end-to-end and network-assisted congestion control. A third type of congestion control (mostly deployed only in internal data-center networks) is hop-by-hop congestion control. In this approach a downstream router/host explicitly informs the previous hop upstream router/host about the amount of free buffer space it has available, and the upstream router will only forward a packet when it knows the downstream router has buffer space. A. Consider the three-hop scenario shown below, where the first and third links have capacity R, and the link between the routers has capacity R/2. What is the maximum throughput of the red connection, given that the red and blue connections are similarly controlled, and therefore have the same maximum throughput*? Host A Host B -2-in: original data Ain: original plus retransmitted R R/2 R -hour ww B. With hop-by-hop congestion control, will the sender need to retransmit due to buffer overflow*? C. With hop-by-hop congestion control and no congestion loss, might the sender still have to sometimes perform retransmission*?
Transcribed Image Text:Question 5 We've learned in class about end-to-end and network-assisted congestion control. A third type of congestion control (mostly deployed only in internal data-center networks) is hop-by-hop congestion control. In this approach a downstream router/host explicitly informs the previous hop upstream router/host about the amount of free buffer space it has available, and the upstream router will only forward a packet when it knows the downstream router has buffer space. A. Consider the three-hop scenario shown below, where the first and third links have capacity R, and the link between the routers has capacity R/2. What is the maximum throughput of the red connection, given that the red and blue connections are similarly controlled, and therefore have the same maximum throughput*? Host A Host B -2-in: original data Ain: original plus retransmitted R R/2 R -hour ww B. With hop-by-hop congestion control, will the sender need to retransmit due to buffer overflow*? C. With hop-by-hop congestion control and no congestion loss, might the sender still have to sometimes perform retransmission*?
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