Wireshark Lab: HTTP v7.0 PDF

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Assignment of Wireshark Lab: HTTP v7.0 ,Data and Computer Communication....

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Lab Assignment 01 Course Code: 514

Submitted to: Fahim Irfan Alam Associate professor University of Chittagong

Submitted by Marufa Sultana 18701008 Session:2017-18

Date:15.02.2020

1. The Basic HTTP GET/response interaction Question 01. Is your browser running HTTP version 1.0 or 1.1? What version of HTTP is the server running? Answer 01: My browser is running http version 1.1 The server is also running http version 1.

Question 02. What languages (if any) does your browser indicate that it can accept to the server? Answer 02 : My browser indicates that it will accept English-US and English languages from the server.

Question 03. What is the IP address of your computer? Of the gaia.cs.umass.edu server? Answer 03 :The IP address of my computer is 192.168.1.102 gaia.cs.umass.edu is 128.119.245.12

Question 04. What is the status code returned from the server to your browser? Answer 04 : The status code returned was 200 OK

Question 05. When was the HTML file that you are retrieving last modified at the server? Answer 05 : The file was last modified on Tue, 23 Sep, 2003 at 05:29:00 GMT

Question 06. How many bytes of content are being returned to your browser? Answer 06 : 73 bytes of content are being returned

Question 07. By inspecting the raw data in the packet content window, do you see any headers within the data that are not displayed in the packet-listing window? If so, name one. Answer 07 : I do not see any different headings between the two windows.

2. The HTTP CONDITIONAL GET/response interaction Question 08. Inspect the contents of the first HTTP GET request from your browser to the server. Do you see an “IF-MODIFIED-SINCE” line in the HTTP GET? Answer 08 : No there is no IF-MODIFIED-SINCE line in the GET message.

Question 09. Inspect the contents of the server response. Did the server explicitly return the contents of the file? How can you tell? Answer 09 : The server did explicitly return the contents of the file. Wireshark includes a section titled “Line-Based Text Data” which shows what the server sent back to my browser which is specifically what the website showed when I brought it up on my browser.

Question 10. Now inspect the contents of the second HTTP GET request from your browser to the server. Do you see an “IF-MODIFIED-SINCE:” line in the HTTP GET? If so, what information follows the “IFMODIFIED-SINCE:” header? Answer 10 : Yes in the second HTTP message an IF-MODIFIED-SINCE line is included. The information that follows is the date and time that I last accessed the webpage

Question 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. Answer 11 :The HTTP status code that the server responded with was a 200 OK, surprisingly. This means that the server explicitly returned the contents of the file. After a Google search, it appears this was not supposed to happen.

3. Retrieving Long Documents Question 12. How many HTTP GET request messages did your browser send? Which packet number in the trace contains the GET message for the Bill or Rights? Answer 12 : My browser sent only one HTTP GET request message. Packet number 8 contained the GET message for the Bill of Rights.

Question 13. Which packet number in the trace contains the status code and phrase associatedwith the response to the HTTP GET request? Answer 13 : The packet that contains the status code and phrase which the server sent in response to the GET message was packet number 14.

Question 14. What is the status code and phrase in the response? Answer 14 : The status code from this packet was a 200, and the phrase was an OK.

Question 15. How many data-containing TCP segments were needed to carry the single HTTP response and the text of the Bill of Rights? Answer 15: The data was sent in 4 TCP segments to the browser, then reassembled.

Question 16. How many HTTP GET request messages did your browser send? To which Internet addresses were these GET requests sent? Answer 16 : 3 HTTP GET request messages were sent by my browser. It sent them to 128.119.245.12, 165.193.123.218, and 134.241.6.82. The last two gets are for the separate locations of the images on the initial web page.

Question 17. Can you tell whether your browser downloaded the two images serially, orwhether they were downloaded from the two web sites in parallel? Explain. Answer 17 : From the looks of it, it would appear they are downloaded serially. This is because a GET is sent out after an OK response is seen. From a quick Google search, it appears this is not common. The Google search suggests that these pictures were downloaded in parallel.

5 HTTP Authentication Question 18. What is the server’s response (status code and phrase) in response to the initial HTTP GET message from your browser? Answer 18 : The servers intial response was “401 Authentication Required”

Question 19. When your browser’s sends the HTTP GET message for the second time, what new field is included in the HTTP GET message? Answer 19: The new field that is now included is the authorization field. This is included because we sent the server a username and password along with our request stating that we were authorized to receive the page....