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Question 4. Web caching. Consider that the Internet has the hierarchical topology composed of three-level ISPS, national, regional and local. Hierarchical caching takes the advantage of the topology of the Internet and deploys the cache at different ISPS. The hit ratios of searching a webpage at different level of the cache of the ISP are as follows: ISP level National Regional Local Hit ratio 0.1 0.3 0.7 The delay (a round trip time) for retrieving the webpages from a remote trans-continental Internet website is 200msec, the delay for retrieving the webpages from a National ISP’s cache is 10msec, and the delays from other caches are all negligible. 1) What is the probability that a requested website is not found in the hierarchical caching? 2) What is the average delay for retrieving a webpage? Here we assume the webpage is very small and the transmission time is negligibleîa 3) Give two advantages of using web caching for web applications.

Question 4. Web caching. Consider that the Internet has the hierarchical topology composed of three-level ISPS, national, regional and local. Hierarchical caching takes the advantage of the topology of the Internet and deploys the cache at different ISPS. The hit ratios of searching a webpage at different level of the cache of the ISP are as follows: ISP level National Regional Local Hit ratio 0.1 0.3 0.7 The delay (a round trip time) for retrieving the webpages from a remote trans-continental Internet website is 200msec, the delay for retrieving the webpages from a National ISP’s cache is 10msec, and the delays from other caches are all negligible. 1) What is the probability that a requested website is not found in the hierarchical caching? 2) What is the average delay for retrieving a webpage? Here we assume the webpage is very small and the transmission time is negligibleîa 3) Give two advantages of using web caching for web applications.

Computer Networking: A Top-Down Approach (7th Edition)
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 4. Web caching. Consider that the Internet has the hierarchical topology composed of three-level ISPS, national, regional and local. Hierarchical caching takes the advantage of the topology of the Internet and deploys the cache at different ISPS. The hit ratios of searching a webpage at different level of the cache of the ISP are as follows: ISP level National Regional Local Hit ratio 0.1 0.3 0.7 The delay (a round trip time) for retrieving the webpages from a remote trans-continental Internet website is 200msec, the delay for retrieving the webpages from a National ISP's cache is 10msec, and the delays from other caches are all negligible. 1) What is the probability that a requested website is not found in the hierarchical caching? 2) What is the average delay for retrieving a webpage? Here we assume the webpage is very small and the transmission time is negligiblei 3) Give two advantages of using web caching for web applications.
Transcribed Image Text:Question 4. Web caching. Consider that the Internet has the hierarchical topology composed of three-level ISPS, national, regional and local. Hierarchical caching takes the advantage of the topology of the Internet and deploys the cache at different ISPS. The hit ratios of searching a webpage at different level of the cache of the ISP are as follows: ISP level National Regional Local Hit ratio 0.1 0.3 0.7 The delay (a round trip time) for retrieving the webpages from a remote trans-continental Internet website is 200msec, the delay for retrieving the webpages from a National ISP's cache is 10msec, and the delays from other caches are all negligible. 1) What is the probability that a requested website is not found in the hierarchical caching? 2) What is the average delay for retrieving a webpage? Here we assume the webpage is very small and the transmission time is negligiblei 3) Give two advantages of using web caching for web applications.
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