assume that it takes a total of 200ms for a client in Japan to retrieve a web pa
ID: 3739399 • Letter: A
Question
assume that it takes a total of 200ms for a client in Japan to retrieve a web page from a server of CNN in Atlanta.CNN installs a proxy web cache in Tokyo with a total response time of 20ms.The proxy server can host 80% of CNN files.
what is the average time for a user in Japan to retrieve a web page from CNN web site?
solution?????
0.8=tdata/(tdata+220)
Stop and Wait: Efficiency Efficiency ( ?): Fraction of time that is spent directly for the user data roc Sr ata +t Small enough terms can be ignored: roc ackExplanation / Answer
As it is mentioned,a client from Japan wants to retrieve web page of CNN from a server in Atlanta.It takes 200ms time.
It is given that, CNN installs a proxy web cache in Tokyo.It's reactive time is 20ms.It can hold only 80% of CNN files.
For a client to receive a web page from CNN,there are two ways.
1:To receive from proxy cache in Tokyo which takes 20ms.
2:To receive it from CNN web server in Atlanta which takes 200ms.
The average time it takes for a client to retrieve a website = 80%20ms+20%200ms
=0.8*20+0.2*200
=16+40
=56ms.
It takes 56ms time for a client in Japan to retrieve a web page from CNN server.
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