1.4.11 Computing maximum thoughput. Consider the scenario shown below, with 10 different servers (three shown) connected to 10 different clients 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 Rs 90 Mbps. Each of the four links from the shared middle link to a client has a transmission capacity of Rc-50 Mbps. What is the end-end maximum throughput on one of the the-hop poths, assuming all servers are sending at the maximum rote possible to their clienti? Answers 30 Mbps 300 Mbps 90 Mbps 50 Mbps 440 Mbps

1.4.11 Computing maximum thoughput. Consider the scenario shown below, with 10 different servers (three shown) connected to 10 different clients 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 Rs 90 Mbps. Each of the four links from the shared middle link to a client has a transmission capacity of Rc-50 Mbps. What is the end-end maximum throughput on one of the the-hop poths, assuming all servers are sending at the maximum rote possible to their clienti? Answers 30 Mbps 300 Mbps 90 Mbps 50 Mbps 440 Mbps

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Compute the propagation delay in this case.
Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links, of rates R1 = 12.8 Mbps, R2 = 4000 kbps, and R3 = 2 Mbps.a. Assuming no other traffic in the network, what is the throughput for the file transfer?b. Suppose the file is 12 million bytes. Dividing the file size by the throughput, roughly how long will it take to transfer the file to Host B?c. Repeat (a) and (b), but now with R2 reduced to 500 kbps.
6. 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) How long does it take if the connection uses persistent HTTP (single connection)? b. c. Suppose that user's access router has a 4 MB buffer (B-byte) on the link from the router to the user. How much delay does this buffer add during periods when the buffer is full? d. Assume a cache rate of 45% on the information received by the user in Madagascar from the Tokyo server. How does…
9. Consider the given scenario where Host A wants to send a file to host B. Calculate the end to end delay between Host A and Host B, when the propagation speed at each link is approximately 2x108 m/sec, and the processing and queuing delays at the router are 10 msec and 25 msec, respectively, when: (a) File size is 1500 bytes and only one packet is sent. 4 (b) File size is 6000 bytes and four packets are sent (1500 bytes in each packet). HOST A R1-200kbps D1=15km Router 1 R2=5Mbps D2=100km HOST B
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
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2. Consider a slotted TDM hierarchical network in which there are 8 computers sharing a 10 Mbps channel to a router R1, sending packets to R1 which must all be forwarded by R1 over an outgoing link (called the MAN link), as shown in Figure 1. Computers A-H always have packets waiting to be sent, so no timeslot on the shared LAN is idle. Ignore the propagation delay on the LAN. The MAN link outgoing from R1 is a 100 Mbps link. The network layer protocol in use has a PDU with exactly 40 bytes of header and exactly 200 bytes of payload (SDU). The DLC layer protocol in use on the LAN has a PDU with exactly 40 bytes of header and 20 bytes of trailer. The DLC layer protocol in use on the outgoing link from R1 has a PDU with 40 bytes of header and no trailer. The physical layer does not impose any bit overhead in either channel. Use 1 Mbps = 1000000 bps. B D E F G H R1 R2 Figure 1 (a) What is the transmission delay of a bit for Computer A? (b) What is the transmission delay of a DLC PDU for…
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)?
Suppose two hosts (Host-A and Host-B) are connected through a shared Ethernet bus of 1 Mbps. The distance between two nodes is 5 meters. The signal propagation speed over physical media is 2.5 x 10^5 meters/second. Compute the propagation delay in this case. What will be the propagation delay for a shared bus of 10 Mbps instead Suppose both hosts sense idle channel at the same time and starts transmission. Will it result in collision (yes or no) If yes: How much time is needed to detect this collision at Host-A? If yes: How much time is needed to detect this collision at Host-B?
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.