5-The four pairs share a common middle hop with a transmission capacity of R =400 Mbps. The four links from the servers to the shared link have a transmissioncapacity of Rs = 70 Mbps. Each of the four links from the shared middle link to aclient has a transmission capacity of Rc = 80 Mbps.270 MR-400 P8070 M50 sA. What is the maximum achievableend-end throughput (in Mbps) foreach of four client-to-serverpairs, assuming that the middlelink is fairly shared (divides itstransmission rate equally)?B. Which link is the bottleneck link?Format as Rc, Rs, or R?

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Answered: 5- The four pairs share a common middle…

Computer Networking: A Top-Down Approach (7th Edition)

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Author:James Kurose, Keith Ross

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Chapter1: Computer Networks And The Internet

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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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1.4.11 Computing maximum thoughput. Consider the scenario shown below, with 10 different servers (three shown) connected to 10 different dients over ten three- hop paths. The pairs share a common middle hop with a transmission capacity of R-300 Mbps. The four links from the servers to the shared link have a transmission capacity of Re90 Mbps. Each of the four links from the shared middle link to a client has a transmission capacity of Re-50 Mbps. What is the end-end maximum throughput on one of the the-hop poths, assuming all servers are sending at the maximum rate possible to their clienti? Answers: 30 Mbps 300 Mbps 90 Mbps 50 Mbps 440 Mbps
Use again the network architecture provided in the figure above, were Rs, Rc and Ri for i = {1,2,3,4}, the transmission rates of the server link, client link and intermediate network links. Consider a message that is 60 · 106 bits long that is to be sent from client to server. Ignore propagation, queuing, and processing delays. c.How long does it take to move the file from source host to destination host when message segmentation is used and both path R1, R2 and path R3, R4 are used? How many packages should be routed from path R1, R2 and how many from path R3, R4 in order to maximize the use of the network? d.What is the end to end throughput if path R1, R2 is used, and what if path R3, R4 is used? What is the total throughput from client to server (if both paths are being used at the same time)?
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39. The figure below shows the TCP Congestion Window for various transmission rounds of a TCP connection. 20 18 16 14 12 10 4 2 2 4 6 10 12 14 16 18 20 Transmission Round How many more (or less) segments will TCP Tahoe send compared to TCP Reno between the transmission rounds 12 and 16 inclusive (i.e., t12 to t16) for the same sequence of events as shown in the graph above (i.e., loss events at t11, tl4 and t16)? a. TCP Tahoe send 13 less segments compared to TCP Reno b. TCP Tahoe send 20 more segments compared to TCP Reno c. TCP Tahoe send 13 more segments compared to TCP Reno d. TCP Tahoe send 20 less segments compared to TCP Reno e. TCP Tahoe send 28 less segments compared to TCP Reno Congestion Window (MSS) 00
The following figure shows that, using relays can extend communication distances. Assume the Decode-and-Forward relays are utilized, and application traffic is FTP/TCP. The peak Throughput (TP) is 42 Mbps for a single Access Point (AP) without using relays. Briefly explain why the peak Throughput (TP) drops to around 20 Mbps using 1 relay, around 14 Mbps using 2 relays and approximate 10 Mbps using 3 relays.
In step 4 of the CSMA/CA protocol, a station that successfully transmits a frame begins the CSMA/CA protocol for a second frame at step 2, rather than at step 1. What rationale might the designers of CSMA/CA have had in mind by having such a station not transmit the second frame. Immediately (if the channel is sensed idle)?
Delays. A user in Madagascar, connected to the internet via a 100 Mb/s (b=bits) connection retrieves a 250 KB (B=bytes) web page from a server in Tokyo, where the page references three images of 500 KB each. Assume that the one-way propagation delay is 82 ms and that the user’s access link is the bandwidth bottleneck for this connection. a.) Approximately how long does it take for the page (including images) to appear on the user’s screen, assuming non-persistent HTTP using a single connection at a time? (For this part, you should ignore queueing delay and transmission delays at other links in the network)b.) Assume a cache rate of 45% on the information received by the user in Madagascar from the Tokyo server. How does this affect your answer in a? Show your work.

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