Question 4 [20 pts] Origin servers Public Internet 15 Mbps access link 100 Mbps LAN Institutional network Consider the figure above, for which there is an institutional network connected to the Internet. Suppose that the average object size is 850,000 bits and that the average 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 institution router) and the average Internet delay. For the average access delay use /(1-), where is the average time required to send an object over the access link and is the arrival rate of objects to the access link. (Assume that the connection is already open - ignore the first RTT) 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