uppose an HTTP client makes a first GET request to the gaia.cs.umass.edu web server for a base page that it has never before requested, which contains an embedded object, which causes the client to make a second GET request. A very short time later, the client then makes a third GET request - for the same base page, with that third GET request having an If-Modified-Since field (as does the 4th GET request that the client makes for the embedded object). Neither the base object nor the jpeg object has changed. How many round trip times (RTTs) are needed from when the client first makes the third GET request (i.e., when it requests the base object for the second time) to when the base page and the jpeg file are displayed a second time, assuming that: any time needed by the server to transmit the base file, or the jpeg file into the server's link is (each) equal to 1/2 RTT the time needed to transmit an HTTP GET into the client's link is zero? the time needed by the server to transmit a reply that does not contain the base page or an embedded jpeg object is zero You should assume that persistent HTTP 1.1 is being used and should think about the consequences of the If-Modified-Since field being used in the third and fourth GET requests). You should take into account any TCP setup time required before an HTTP GET is actually sent by the client, the time needed for the server to transmit a requested object (see assumptions above), and any propagation delays not accounted for in these amounts of time. Group of answer choices A.2.5 RTT B.2 RTT C.5 RTT D.1 RTT E.4 RTT

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 an HTTP client makes a first GET request to the gaia.cs.umass.edu web server for a base page that it has never before requested, which contains an embedded object, which causes the client to make a second GET request. A very short time later, the client then makes a third GET request - for the same base page, with that third GET request having an If-Modified-Since field (as does the 4th GET request that the client makes for the embedded object). Neither the base object nor the jpeg object has changed.

How many round trip times (RTTs) are needed from when the client first makes the third GET request (i.e., when it requests the base object for the second time) to when the base page and the jpeg file are displayed a second time, assuming that:

any time needed by the server to transmit the base file, or the jpeg file into the server's link is (each) equal to 1/2 RTT
the time needed to transmit an HTTP GET into the client's link is zero?
the time needed by the server to transmit a reply that does not contain the base page or an embedded jpeg object is zero

You should assume that persistent HTTP 1.1 is being used and should think about the consequences of the If-Modified-Since field being used in the third and fourth GET requests). You should take into account any TCP setup time required before an HTTP GET is actually sent by the client, the time needed for the server to transmit a requested object (see assumptions above), and any propagation delays not accounted for in these amounts of time.

Group of answer choices

A.2.5 RTT

B.2 RTT

C.5 RTT

D.1 RTT

E.4 RTT

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