P16. Consider the following network. ISP B provides national backbone service to regional ISP A. ISP C provides national backbone service to regional ISP D. Each ISP consists of one AS. B and C peer with each other in two places using BGP. Consider traffic going from A to D. B would prefer to hand that traffic over to C on the West Coast (so that C would have to absorb the cost of carrying the traffic cross-country), while C would prefer to get the traffic via its East Coast peering point with B (so that B would have carried the traffic across the country). What BGP mechanism might C use, so that B would hand over A-to-D traffic at its East Coast peering point? To answer this question, you will need to dig into the BGP specification. ISP A

P16. Consider the following network. ISP B provides national backbone service to regional ISP A. ISP C provides national backbone service to regional ISP D. Each ISP consists of one AS. B and C peer with each other in two places using BGP. Consider traffic going from A to D. B would prefer to hand that traffic over to C on the West Coast (so that C would have to absorb the cost of carrying the traffic cross-country), while C would prefer to get the traffic via its East Coast peering point with B (so that B would have carried the traffic across the country). What BGP mechanism might C use, so that B would hand over A-to-D traffic at its East Coast peering point? To answer this question, you will need to dig into the BGP specification. ISP A

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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1) Consider a reliable data transfer protocol that uses only negative acknowledgments. Suppose the sender sends data only infrequently. Would a NAK-only protocol be preferable to a protocol that uses ACKs? Why? 2) Besides network-related considerations such as delay, loss, and bandwidth performance, there are other important factors that go into designing a CDN server selection strategy. What are they? 3) What are the five layers in the Internet protocol stack? What are the principal responsibilities of each of these layers? List five tasks that a layer can perform. 4) Why do HTTP, SMTP, and POP3 run on top of TCP rather than on UDP? 5) List six access technologies. Classify each one as home access, enterprise access, or wide-area wireless access, and then describe how they fundamentally operate.
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a) Explain how OSPF routing becomes more scalable in a large network by partitioning it in areas and a backbone area. What is the drawback of breaking a network in smaller areas compared to running OSPF in the original network? b) What is the role of the sequence number in the OSPF LSP?
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Consider the throughput example presented in the figure below. Now suppose that there are 4 client-server pairs. Denote Rs1, Rs2, Rs3,Rs4 ,Rc1 ,Rc2 ,Rc3, Rc4 and R for the rates of the server links, client links, and network link. Assume all other links have abundant capacity and that there is no other traffic in the network besides the traffic generated by the 4 client-server pairs. Question:derive a general expression for throughput for the Client Server pair 1, in terms of Rsi, ,Rciand R.
Consider the throughput example presented in the figure below. Now suppose that there are 4 client-server pairs. Denote RS1, RS2, RS3, RS4, RC1, RC2, RC3, RC4 and R for the rates of the server links, client links, and network link. Assume all other links have abundant capacity and that there is no other traffic in the network besides the traffic generated by the 4 client-server pairs. Question:Assume that for i = {1,2,3,4}, RSi = RCi = R. Furthermore, assume that all routers have infinite buffer capacity, meaning that packets are never dropped and are eventually forwarded by a router. What is the throughput for the Client Server pair 1? What is the throughput for Client Server pair 3?
What is the end-end delay of a packet from when it first begins transmission on link 1, until is it received in full by the server at the end of link 3. Assume store-and forward packet transmission. Write your answer in msec