EL is not cached ose that three C DNS server vis d third DNS co

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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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 three DNS servers are visited before your host receives the IP address from
DNS. The first DNS server visited is the local DNS cache, with an RTT delay of RTT = 4 msecs.
The second and third DNS servers contacted have RTTs of 45 and 24 msecs, respectively.
Initially, let's suppose that the Web page associated with the link contains exactly one object,
consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web
server containing the object is RTTHTTP = 9 msecs.
Assuming zero transmission time for the HTML object, how much time elapses from when the
client clicks on the link until the client receives the object?
(Do not forget the TCP handshake(s).)
82 msecs
O 91 msecs
O 46 msecs
O 67 msecs
Transcribed Image Text: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 three DNS servers are visited before your host receives the IP address from DNS. The first DNS server visited is the local DNS cache, with an RTT delay of RTT = 4 msecs. The second and third DNS servers contacted have RTTs of 45 and 24 msecs, respectively. Initially, let's suppose that the Web page associated with the link contains exactly one object, consisting of a small amount of HTML text. Suppose the RTT between the local host and the Web server containing the object is RTTHTTP = 9 msecs. Assuming zero transmission time for the HTML object, how much time elapses from when the client clicks on the link until the client receives the object? (Do not forget the TCP handshake(s).) 82 msecs O 91 msecs O 46 msecs O 67 msecs
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