Question: 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

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,..., RTTn.

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