Consider the following illustration of a proxy server,ClientClientClientTransmission rate RProxy Cache ServerTransmission rate: R₂InternetWeb ServerAssume 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 = 20 Mb/s, and the transmissionrate of the webserver is Rs = 24 Mb/s. If clients transmit on average 1100 HTTP requests per second and the proxy server has a cache hit rate of 30%, what is the traffic intensity at the link connecting the proxy server to the Internet? (provide your answer to 2significant figures)

Answered: Consider the following illustration of…

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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Question

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 = 20 Mb/s, and the transmission
rate of the webserver is Rs = 24 Mb/s. If clients transmit on average 1100 HTTP requests per second and the proxy server has a cache hit rate of 30%, what is the traffic intensity at the link connecting the proxy server to the Internet? (provide your answer to 2
significant figures)

Expert Solution

Step 1

To calculate the traffic intensity at the link connecting the proxy server to the Internet, we need to determine the total amount of data transmitted per second over the link. We can calculate this as the sum of the data transmitted by the proxy server to the clients and the data transmitted by the proxy server to the web server.

The data transmitted by the proxy server to the clients can be calculated as follows:

The number of HTTP requests per second = 1100
The cache hit rate = 30%
Therefore, the number of HTTP requests that require transmission to the web server = 1100 * (1 - 0.3) = 770 requests per second
The size of each HTTP message containing an object = 1 KB
Therefore, the amount of data transmitted by the proxy server to the clients = 770 * 1 KB = 770 KB/s