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 a RTT $($round$-$trip time$)$ of RTT$1,...,$ and RTT $n.$ Further suppose that the Web page

associated with the link contains exactly one object, consisting of a small amount of HTML text. Let

RTT$0$ 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?

Referring to Problem $1,$ now suppose the HTML file references seven very small objects on the same

server. Neglecting transmission times, how much time elapses with

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

b$.$ Non$-$persistent HTTP with the browser configured for three parallel connections?

c$.$ Persistent HTTP$?$