3. (20 points) Web Caching Consider the following network, where hosts in an institutional network can download files from both remote origin servers and a local proxy cache. origin servers 2 Mbps access linlk 10 Mbps AN Iweb che Suppose: The average object size is 100,000 bits. The average request rate from the institution's browsers to the origin servers is 10 requests/sec The missing rate of the web cache is 0.3. The round-trip delay from the access router to any origin server and back to router is 2 sec. The round-trip delay from the clients to the local proxy cache is 2 msec. - Ignoring the time for DNS query. For the average Internet access delay, use /(1-M an object over the access link and is the arrival rate of objects to the access link. Find the average total response time for a client to download a file. ) , where is the average time required to se