1. Textbook problem 8(a)-(c) (30 points, 10 points for each)

P7. 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 RTT of RTT₁,..., RTT. Further suppose that the

Web page associated with the link contains exactly one object, consisting of

a small amount of HTML text. Let RTTo denote the RTT between the local

host and the server containing the object. Assuming zero transmission time

of the object, how much time elapses from when the client clicks on the link

until the client receives the object?

P8. Referring to Problem P7, suppose the HTML file references eight very small

objects on the same server. Neglecting transmission times, how much time

elapses with you only need to do P8

a. Non-persistent HTTP with no parallel TCP connections?

b. Non-persistent HTTP with the browser configured for 6 parallel

connections?

c. Persistent HTTP?