i origin servers origins public Internet KX 1.5 Mbps access link institutional network 100 Mbps LAN a. (2pts) What is the total average response time T ? b. (2pts) Now suppose a cache is installed in the institutional LAN and its hit rate is p. What is the total average response time T,? c. We didn't model DNS delays above. Suppose the root, TLD, and authoritative name servers are located at round-trip latencies of R1, R2, R3 seconds respectively. What is the additional delay introduced by DNS if i) (2pts) the institution maintains a local name server internally in its LAN ii) (2pts) the local name server in maintained by the institution's ISP at a round-trip distance of Ro i origin servers origins public Internet KX 1.5 Mbps access link institutional network 100 Mbps LAN a. (2pts) What is the total average response time T ? b. (2pts) Now suppose a cache is installed in the institutional LAN and its hit rate is p. What is the total average response time T,? c. We didn't model DNS delays above. Suppose the root, TLD, and authoritative name servers are located at round-trip latencies of R1, R2, R3 seconds respectively. What is the additional delay introduced by DNS if i) (2pts) the institution maintains a local name server internally in its LAN ii) (2pts) the local name server in maintained by the institution's ISP at a round-trip distance of Ro