Question about DNS Query Access Time

C. DNS Query Access Time: 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 before retrieving the web page. Suppose that three DNS servers are visited before your host receives the IP address from the local DNS server. The first DNS server visited is the local DNS, with an RTT delay of RTTo- 3 msecs. The second and third DNS servers contacted have RTTs of RTT, -40 msecs and RTT2-20 msecs. The requested Web page contains a base HTML page and no objects. Suppose the RTT between the Client and the Web server is RTTHTT 60 msecs, i.e. it takes 60msecs for the Client to fetch the web page from the web server. (Note: RTT = Round Trip Time-the time to send request and receive response - inclusive, both directions) Web Server RTT RTT RTTHTP RTT local DNS cache client With respect to the above information, answer the following questions: How much time in total is spent on the DNS query? How long does it take to retrieve the web page once the URL name is resolved? How much total time elapses from when the client first clicks on the link until the client receives the web page? (Assume 0 seconds transmission time for the web page - makes the problem easier, but not really true for a large file!) a. b. c