a. Explain how using the conditional GET method and web caching can improve the response time for HTTP requests. b. To emphasize the importance of web caching, consider the following scenario: An institutional network runs over a LAN with RLAN = 100 Mbps, that has several hosts acting primarily as HTTP clients. The gateway router of the institution is connected to the ISP router, in the public Internet, by a DSL link with Race = 10 Mbps. The origin HTTP servers, also attached to the Internet, have web objects eg. HTMLJPG, MPEG files that are requested by the clients. Suppose that the average request size is Leg = 1 kilobits, the average object size is Robj = 1 megabits, and that the average request rate from the HTTP clients to the origin servers is = 10 req /s. Assume the average round-trip Internet delay is Tint = 1s. As a rough approximation, if the traffic intensity on a given link is p