1. Suppose within your Web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS lookup is necessary to obtain the IP address. Suppose that only one DNS server, the local DNS cache, is visited with an RTT delay of RTT0 = 1 msecs. Initially, let's suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web server containing the object is RTT_HTTP = 97 msecs.

Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object?

A. 194 msecs B. 97 msecs C. 195 msecs D. None

2. Consider a DASH system for which there are N video versions (at N different rates and qualities) and N audio versions (at N different rates and qualities). Suppose we want to allow the player to choose at any time any of the N video versions and any of the N audio versions.

If we create files so that the audio is mixed in with the video, so server sends only one media stream at given time, how many files will the server need to store (each a different URL)?

A. N files B. 3N files C. 3 N+1 files D. N^2 files

3. Consider an HTTP client that wants to retrieve a Web document at a given URL. The IP address of the HTTP server is initially unknown. What transport and application-layer protocols besides HTTP are needed in this scenario?

A. Application layer protocols: POP and HTTP (Transport layer protocols: TCP for POP and HTTP)

B. Application layer protocols: P2P and HTTP (Transport layer protocols: UDP for P2P and TCP for HTTP)

C. Application layer protocols: DNS and HTTP (Transport layer protocols: UDP for DNS and TCP for HTTP)

D. none