1. Thensider the Web Cache example discussed in class, for which there is an institutional network connected to the Intemet over a 15Mbps access link. Suppose that the average object size is 850,000 bits and that the avenage request rate from the institution's browsers to the origin servers is 16 requests per second. Also, suppose that the amount of time it takes from when the router on the Internet side of the access link forwards an HTTP request until it receives the response is three seconds on average. Model the total average response time as the sum of the average access delay (that is, the delay from Internet router to instirution router) and the average Intemet delay. In other words, delay to access within the institutional LAN is negligible. For the average access delay, use /(1) where is the average time required to send an object over the access link and B is the arrival rate of objects to the access link. (a) Find the total average response time. (b) Now suppose a cache is installed in the institutional LAN. Suppose the miss rate is 0.4. Find the total response time. 2. - Consider a 50,000 -customer video server, where each customer watches three movies per month. Twethirds of the movies are served at 9 P.M. How many movies does the server have to transmit at once during this time period? If each movie requires 6Mbps, how many OC12 connections (each 622Mbps ) does the server need to the network? Consider distributing a file of F=1510 bits to N peer. The server has an upload rate of W. =30.Mbp, and each peer has a download rate of d=21/bpis and un upload rate of u4=1Mbbps. For N=1000, calculate the minimum distribution time for both clicat-server distribation and P2P distribution