1. Consider Figure 2.12, for which there is an institutional network connected to the Internet. Suppose that the average object size is 5 00,000 bits and that the average request rate from the institutions browsers to the origin servers is 20 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 (see Section 2.2.5). 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 A/(1 AB), where A 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 and a request can be response by the cache in 0.05 sec. Find the total response time.

Picture includes the following info: 15 mbps access link and 100mbps LAN

I already did A, but B is giving me difficulty