Question 3 : An educational institution has an access network whose operating parameters are as follows: ▪ access link to originating servers' rate: 15.4 Mbps RTT from institutional router to server: 2 sec ▪ ▪ 3.1. You are requested to provide the performance of the institutional access network in terms of Web object size: 100K bits Average request rate from browsers to origin servers: 150/sec average data rate to browsers: 45.0 Mbps Institutional access network speed: 1Gbps. 3.2. Note: Assume that the requests from the web client to the originating web servers are of the order of 2GB of data on average. Assuming that the institution would like to install a web cache in its access network with a cache hit rate is 0.65, you are asked to recompute the new performance of the access network in terms of: • LAN utilization • Access link utilization End-to-end delay from the access network to the origin servers. 3.2.1. 3.2.2. 3.2.3. 3.3. LAN utilization Access link utilization End-to-end delay Please compare the performance achieved by the network with and without caching.

Question 3 : An educational institution has an access network whose operating parameters are as follows: ▪ access link to originating servers' rate: 15.4 Mbps RTT from institutional router to server: 2 sec ▪ ▪ 3.1. You are requested to provide the performance of the institutional access network in terms of Web object size: 100K bits Average request rate from browsers to origin servers: 150/sec average data rate to browsers: 45.0 Mbps Institutional access network speed: 1Gbps. 3.2. Note: Assume that the requests from the web client to the originating web servers are of the order of 2GB of data on average. Assuming that the institution would like to install a web cache in its access network with a cache hit rate is 0.65, you are asked to recompute the new performance of the access network in terms of: • LAN utilization • Access link utilization End-to-end delay from the access network to the origin servers. 3.2.1. 3.2.2. 3.2.3. 3.3. LAN utilization Access link utilization End-to-end delay Please compare the performance achieved by the network with and without caching.

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 a local network with a 1 Gbps access link to the Internet. Hosts on this network are accessing resources with an average size of 2 MB from a distant server at an average rate of 50 requests per second. a. What is the link utilization of the access link to the internet? b. Suppose these requests were to go through a caching proxy server. What would the link utilization to the internet be if half of all requests were served from the cache of the proxy server? с. resources never being needed for example.) Would this still provide any advantages to the end user? Would there be any disadvantages to the end user? Suppose the proxy server could not serve any content from cache (due to the same
Question 3 : An educational institution has an access network whose operating parameters are as follows: ▪ access link to originating servers' rate: 15.4 Mbps RTT from institutional router to server: 2 sec ▪ ▪ ▪ . 3.1. You are requested to provide the performance of the institutional access network in terms of • LAN utilization * • Web object size: 100K bits Average request rate from browsers to origin servers: 150/sec average data rate to browsers: 45.0 Mbps Institutional access network speed: 1Gbps. Note: Assume that the requests from the web client to the originating web servers are of the order of 2GB of data on average. 3.2. Access link utilization End-to-end delay from the access network to the origin servers. Assuming that the institution would like to install a web cache in its access network with a cache hit rate is 0.65, you are asked to recompute the new performance of the access network in terms of: 3.2.1. 3.2.2. 3.2.3. LAN utilization Access link utilization End-to-end…
Question 3: An educational institution has an access network whose operating parameters are as follows: access link to originating servers’ rate: 15.4 Mbps RTT from institutional router to server: 2 sec Web object size: 100K bits Average request rate from browsers to origin servers: 150/sec average data rate to browsers: 45.0 Mbps Institutional access network speed: 1Gbps. 3.1. You are requested to provide the performance of the institutional access network in terms of• LAN utilization• Access link utilization• End-to-end delay from the access network to the origin servers. Note: Assume that the requests from the web client to the originating web servers are of the order of 2GB of data on average. 3.2. Assuming that the institution would like to install a web cache in its access network with a cache hit rate is 0.65, you are asked to recompute the new performance of the access network in terms of:3.2.1. LAN utilization3.2.2. Access…
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 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…
Please show the steps. Thanks 3. Consider Figure 2 for which there is an institutional network connected to the Internet. Suppose that the average object size is 80, 000 bits and that the average request rate from the institution's browsers to the origin servers is 18 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 1.5 seconds on average. Let the average time be the sum of the average access delay and the average Internet delay. For average access delay, use A/(1 – AB), where A is the average time required to send an object over the access link and ß is the arrival rate of objects to the access link. origin servers public Internet 1.6 Mbps access link institutional network 10 Mbps LAN Figure 2: Diagram for Problem 3 (a) -Find the average response time. (b) rate is 0.4. Find the response time. Note that the response time is close to zero if the Now…
Assume a client is connected to the server and has already received an HTML webpage. It reads the webpage, and it now needs to get 3 new files, File A is 5 MB file B is 1 MB and file C is 1 KB. The client requests the files in the order A B C. The link has an RTT (round trip time) of 0.5 seconds and a bandwidth of 8 Mb/s(Megabits per second) (or 1 Megabyte per second). The client can reuse the open connection if the protocol allows it to. For all parts of this problem ignore header sizes, and start the timer when the client sends How long does it take to get file C under HTTP 0? How long does it take to get file C under HTTP 1 (assume the browser does not support pipeling)? How long does it take to get file C under HTTP 2 assuming a frame size of 1 KB and no server push? What event would make HTTP 3 faster than HTTP 2 for this use case (ignore TLS)?
A set of web browsers on the institutional network at USC generates an average of 15.0 requests/second for web objects of size 1.0 Mb. The access link to the public Internet is 15 Mbps. USC’s LAN operates at 1 Gbps. Assume LAN delay and internet delay are negligible. Suppose you installed a web cache and found that access link utilization was reduced to 9.0 Mbps. From your findings, what is the cache hit rate that resulted in this reduction in access link utilization?
Computer Science Suppose KDC X serves one community of users and KDC Y serves a different community of users. KDC X and KDC Y have an established shared symmetric key KXY. Develop the steps of communication needed to enable customer A of KDC X community, to obtain a shared session key with customer B of KDC Y community. KDC X shares a symmetric key with A, KAX, and KDC Y shares a symmetric key with B, KBY. At the end of the steps of communication A and B will have established a session key, KAB.
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