The website of an e-retailer receives 3, 200, 000 requests per month. To postpon

ID: 2901004 • Letter: T

Question

The website of an e-retailer receives 3, 200, 000

requests per month. To postpone a new T1 link

to the ISP, the site manager is considering using

a caching proxy that is available on the ISP.

Since the caching is useful only for the static

pages, the manager wants to know, a priori, the

benefits of caching. Following data is available

from the analysis of the server log.

?? 65% of the requests are for GIF files and the rest of

the requests are for the dynamic pages

?? Average size of the GIF files is 7, 300 bytes

?? Average size of the HTML pages is 13, 500 bytes

find hit ratio and saved bandwidth ?

1. Hit Ratio

Same as that of the % of static GIF files : 65%

2.Saved bandwidth

NoofRequests * HitRatio * Average Size

= 3, 200, 000 * 0.65* 7, 300

= 14, 828, 125 Kbytes per months

= (14, 828, 125 * 8) / (30*24*60*60)

= 45. 77 Kbps

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