Question 3 (20 points): Origin servers Public Internet 15 Mbps access link X 100 Mbps LAN Institutional network Institutional cache Figure 1 Consider Figure 1, for which there is an institutional network connected to the Internet. The institutional network is a high-speed LAN of 100 Mbps. A router in the institutional network and a router in the Internet are connected by a 15 Mbps link. There is a cache server in the Institutional network. Suppose that the average object size is 500,000 bits. a. Without the institutional cache, how many requests per second from the institutional network does the link to the public Internet sustain? (Namely, how many requests per second will make the traffic intensity on the link be one?) b. Assume that we use the institutional cache server and its hit rate is 0.6. How many requests per second will make the traffic intensity on the link be one? Question 3 (20 points): Origin servers Public Internet 15 Mbps access link X 100 Mbps LAN Institutional network Institutional cache Figure 1 Consider Figure 1, for which there is an institutional network connected to the Internet. The institutional network is a high-speed LAN of 100 Mbps. A router in the institutional network and a router in the Internet are connected by a 15 Mbps link. There is a cache server in the Institutional network. Suppose that the average object size is 500,000 bits. a. Without the institutional cache, how many requests per second from the institutional network does the link to the public Internet sustain? (Namely, how many requests per second will make the traffic intensity on the link be one?) b. Assume that we use the institutional cache server and its hit rate is 0.6. How many requests per second will make the traffic intensity on the link be one