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Tdtfyh Jvhkbvjkn Hvhkb, Jb Essay

1246 words - 5 pages

Wireshark Lab: HTTP
SOLUTION
Supplement to Computer Networking: A Top-Down
Approach, 6th ed., J.F. Kurose and K.W. Ross
© 2005-21012, J.F Kurose and K.W. Ross, All Rights Reserved

The following screen shots showing the HTTP GET and HTTP reply answer these questions:
1. Is your browser running HTTP version 1.0 or 1.1? What version of HTTP is the server
running?
2. What languages (if any) does your browser indicate that it can accept to the server?
3. What is the IP address of your computer? Of the gaia.cs.umass.edu server?
4. What is the status code returned from the server to your browser?
5. When was the HTML file that you are retrieving last modified at the server?
6. How ...view middle of the document...

Do you see an “IF-MODIFIED-SINCE:” line in the HTTP GET? If so, what
information follows the “IF-MODIFIED-SINCE:” header?
11. What is the HTTP status code and phrase returned from the server in response to this
second HTTP GET? Did the server explicitly return the contents of the file?
Explain.
Here are the four captures packets (two GETs and two REPLIES, in chronological order):

©2013 Pearson Education, Inc. Upper Saddle River, NJ. All Rights Reserved.

There is no IF-MODIFIED-SINCE in the first GET

text returned in response to first GET

©2013 Pearson Education, Inc. Upper Saddle River, NJ. All Rights Reserved.

2nd GET has IF-MODIFED-SINCE

The file has not been modified!
So the text of the file is NOT
returned in the HTTP message

3. Retrieving Long Documents
In our answer below, we use the http-ethereal-trace-3 packet trace file. The HTTP GET
for the long document is packet 8 in the trace (at t=4.623732); the HTTP OK reply is
packet 14 (at t=6.680432).

©2013 Pearson Education, Inc. Upper Saddle River, NJ. All Rights Reserved.

The HTTP repl7 carrying the text of the Bill of Rights are packets 10, 11, and 13. If you
look into the ASCII content of packet 10, you can see the beginning of the text of the Bill
or Rights. Note that packet 12 is a client-to-server TCP ACK.
Answer the following questions:
12. How many HTTP GET request messages did your browser send? Answer: 1. Which
packet number in the trace contains the GET message for the Bill or Rights? Answer: 8.
13. Which packet number in the trace contains the status code and phrase associated with the
response to the HTTP GET request? Answer: packet 10.
14. What is the status code and Phrase in the response? Answer: 200 (OK)
15. How many data-containing TCP segments were needed to carry the single HTTP
response and the text of the Bill of Rights? Answer: three packets (10, 11, 13 in the trace)

4. HTML Documents with Embedded Objects
In our answers below, we use the http-ethereal-trace-4 packet trace file.
Answer the following questions:
16. How many HTTP GET request messages did your browser send? Answer: there were
three HTTP GET messages sent: packet 10 in the trace (to get the base file), packet 17 (to
get the Pearson logo) and packet 20 (to get the 5th edition textbook cover). To which
Internet addresses were these GET requests sent? Each of these three GET messages
were sent to different IP addresses! Packet 10 was sent to 128.119.245.12, packet 17 to
165.193.123.218, and packet 20 to 134.241.6.82.

©2013 Pearson Education, Inc....

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