Suppose within your Web browser you click on a link to obtai…
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 n DNS servers are visited before your host receives the IP address from DNS; the successive visits incur an round trip time (RTT) of RTT1, …, RTTn. Further suppose that the Web page associated with the link consists of an HTML file and eight very small referenced objects on the same server. Let RTT0 denote the RTT between the local host and the server containing the objects. Neglecting transmission times, how much time elapses from when the client clicks on the link until the client receives all the objects with persistent HTTP?
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Consider two hosts, A and B, connected by a single link of rate 1 Mbps. Suppose that the two hosts are separated by 300 Km, and suppose the propagation speed along the link is 3×108 m/s. Host A is to send a packet of 1,000 bytes to Host B. Calculate the transmission delay in seconds.
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