Question

Do the fllowing:
• Start up your web browser, and make sure your browser's cache is cleared, as
discussed above.
• Start up the Wireshark packet sniffer
• Enter the fllowing URL into your browser
http://gaia.cs.umass.edu/wireshark-labs/HTTP-wireshark-file4.html
Your browser should display a short HTML fle with two images. These two
images are refrenced in the base HTML fle. That is, the images themselves are
not contained in the HTML; instead the URLs fr the images are contained in the
downloaded HTML fle. As discussed in the textbook, your browser will have to
retrieve these logos fom the indicated web sites. Our publisher's logo is
retrieved fom the gaia.cs.umass.edu web site. The image of the cover fr our 5th
edition (one of our fvorite covers) is stored at the caite.cs.umass.edu server.
(These are two different web servers inside cs.umass.edu).
• Stop Wireshark packet capture, and enter "http" in the display-flter-specifcation
window, so that only captured HTTP messages will be displayed.
• (Note: If you are unable to run Wireshark on a live network connection, you can
use the http-ethereal-trace-4 packet trace to answer the questions below; see
fotnote 1. This trace fle was gathered while perfrming the steps above on one
of the author's computers.)
Answer the fllowing questions:
16. How many HTTP GET request messages did your browser send? To which
Internet addresses were these GET requests sent?
17. Can you tell whether your browser downloaded the two images serially, or
whether they were downloaded fom the two web sites in parallel? Explain.

Answer 1

Answer 16
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4 GET request sent by browser as you can see in the screenshot below , destination ip address is 128.119.245.12

Answer 17
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they are downloaded serially one after another GET request one GET request sent and image download and then another GET request sent and another image has been downloaded.

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