Performance: Maximum end-end throughput. Consider the scenario shown below,with a single source client sending to a server over two links of capacities R₁=100Mbps and R3=50 Mbps.10 Mbps50 MbpsR₁What is the maximum achievable end-end throughput (in Mbps, give an integer value)for the client-to-server pair, assuming that the client is trying to send at its maximumrate?Depends to the packet size100 MbpsR3Your answer is incorrect!www

A client-to-server pair refers to a fundamental communication relationship in computer networking,…

Performance: Maximum end-end throughput. Consider the scenario shown below, with a single source client sending to a server over two links of capacities R₁=100 Mbps and R3=50 Mbps. 10 Mbps What is the maximum achievable end-end throughput (in Mbps, give an integer value) for the client-to-server pair, assuming that the client is trying to send at its maximum rate? 50 Mbps R₁ Depends to the packet size 100 Mbps R3

Performance: Maximum end-end throughput. Consider the scenario shown below, with a single source client sending to a server over two links of capacities R₁=100 Mbps and R3=50 Mbps. 10 Mbps What is the maximum achievable end-end throughput (in Mbps, give an integer value) for the client-to-server pair, assuming that the client is trying to send at its maximum rate? 50 Mbps R₁ Depends to the packet size 100 Mbps R3

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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Consider the figure used to illustrate Web caching below. Suppose that the access link capacity is C bits/sec and the average object size is S bits and that the average request rate from the institution’s browsers to the origin servers is A requests/sec. Also, suppose that the amount of time it takes from when the router on the Internet side of the access link forwards an HTTP request until it receives the response is T secondson average. Model the total average response time perceived by the institutional users as the sum of the average access delay (that is, the delay from the Internet router to institution router) and the average Internet delay. For the average access delay, use D/(1 − DB), where D is the average time required to transmit an object over the access link and B is the arrival rate of objects to the access link. Note that this access delay includes both the transmission and queuing delays. (Note also that B = A if there isno caching.) Ignore the details of persistent or…
Consider the following illustration of a proxy server, Client Client Client Transmission rate R Proxy Cache Server Transmission rate: R₂ Internet Web Server Assume that HTTP messages containing objects are 1 KB and that HTTP messages not containing objects can be ignored as they do not produce a significant delay. Also, assume the transmission rate of the proxy server, Rp = 25 Mb/s, and the transmission rate of the webserver is Rs = 14 Mb/s. If clients transmit on average 1500 HTTP requests per second and the proxy server has a cache hit rate of 70%, what is the traffic intensity at the link connecting the proxy server to the Internet? (provide your answer to 2 significant figures)
Consider the figure used to illustrate Web caching below. Suppose that the access link capacity is C bits/sec and the average object size is S bits and that the average request rate from the institution’s browsers to the origin servers is A requests/sec. Also, suppose that the amount of time it takes from when the router on the Internet side of the access link forwards an HTTP request until it receives the response is T secondson average. Model the total average response time perceived by the institutional users as the sum of the average access delay (that is, the delay from the Internet router to institution router) and the average Internet delay. For the average access delay, use D/(1 − DB), where D is the average time required to transmit an object over the access link and B is the arrival rate of objects to the access link. Note that this access delay includes both the transmission and queuing delays. (Note also that B = A if there isno caching.) Ignore the details of persistent or…
Maximum end-end throughput (e). Consider the scenario below where 4 TCP senders are connected to 4 receivers. Servers 1 - 3 transmit to the receiving hosts at the fastest rate possible (i.e., at the rate at which the bottleneck link between a server and its destination is operating at 100% utilization, and is fairly shared among the connections passing through that link). Server 4 has nothing to send, so its sending rate is zero. Suppose that R = 1 Gbps, Rc is 300 Mbps and Rs is 400 Mbps. What is the TCP throughput achieved on each of the 3 sctive-sending connections? A. 4R B. Rc C. R/4…
Consider the scenario below where 4 TCP senders are connected to 4 receivers. The servers transmit to the receiving hosts at the fastest rate possible (i.e., at the rate at which the bottleneck link between a server and its destination is operating at 100% utilization, and is fairly shared among the connections passing through that link). R =1 Gbps and Rc is 300 Mbps and Rs is 400 Mbps. And that all four senders have data to send, What is the minimum value of Re that will ensure that the connections to Host-1 and Host-2 are not bottlenecked at links with capacity Rc or Re?
Consider the throughput example. 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 , assume that all routers have infinite buffercapacity, meaning that packets are never dropped and are eventually forwarded by a router. Whatis the throughput for the Client Server pair 1? What is the throughput for Client Server pair 3?
TCP a. Consider two TCP connections, one between Hosts A (sender) and B (receiver), and another between Hosts C (sender) and D (receiver). The RTT between A and B is half that of the RTT between C and D. Suppose that the senders' (A's and C's) congestion window sizes are identical. Is their throughput (number of segments transmitted per second) the same? Explain. b. Now suppose that the average RTT between A and B, and C and D are identical. The RTT between A and B is constant (never varies), but the RTT between C and D varies considerably. Will the TCP timer values of the two connections differ, and if so, how are they different, and why are they different? Give one reason why TCP uses a three-way (SYN, SYNACK, ACK) handshake rather than a two-way handshake to initiate a connection. a.
Consider Figure 2.12, for which there is an institutional network connected to the Internet. Suppose that the average object size is 1,000,000 bits and that the average request rate from the institution’s browsers to the origin servers is 16 requests per second. Also suppose that the amount of time it takes from when the router on the Internet side of the access link forwards an HTTP request until it receives the response is three seconds on average (see Section 2.2.5). Model the total average response time as the sum of the average access delay (that is, the delay from Internet router to institution router) and the average Internet delay. For the average access delay, use ∆/(1 - ∆b), where ∆ is the average time required to send an object over the access link and b is the arrival rate of objects to the access link. Find the total average response time. I get ∆=1000000/15000000= 1/15, then ∆/(1 - ∆b)= (1/15)/(1-(1/15)*16)=-1, so the finally answer is : 3+(-1)=2s or 3+0=3s?
Consider an HTTP server and client as shown in the figure below. Suppose that the RTT delay between the client and server is 13 msecs; the time a server needs to transmit an object into its outgoing link is 1 msecs. Any other HTTP message not containing an object has a negligible (zero) transmission time. Suppose the client again makes 106 requests, one after the other, waiting for a reply to a request before sending the next request. Assume the client is using HTTP 1.1 and the IF-MODIFIED-SINCE header line. Assume 47% of the objects requested have NOT changed since the client downloaded them (before these 106 downloads are performed). Clients RTT delay: t Transmission delay: ta Intemet APACHE Server How much time elapses (in milliseconds) between the client transmitting the first request, and the completion of the last request?
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Performance: Maximum Throughput (2). Now consider the network shown below, with two senders on the left sending packets to a common receiver on the right. The links have transmission rates of R₁ =75 Mbps, R₂ = 100 Mbps, and R3 = 60 Mbps. R₁ R₁ 235 Mbps 30 Mbps What is the maximum end-to-end throughput achieved by each session, assuming both sessions are sending at the maximum rate possible? 310 Mbps 60 Mbps 100 Mbps R₂- 75 Mbps R3 wwww
Suppose Host A wants to send a large 8 million bytes of file to Host B. The path from Host A to Host B has three links, of rates R1 = 1.5 Mbps, R2 = 2 Mbps, and R3 = 1 Mbps. Assuming no other traffic in the network. Roughly how long will it take to transfer the file to Host B?