What is the sequence number of the TCP SYN segment that is used to initiate the TCP  connection between the client computer and gaia.cs.umass.edu? What is it in the segment that  identifies the segment as a SYN segment? 4. What is the sequence number of the SYNACK segment sent by gaia.cs.umass.edu to the  client computer in reply to the SYN? What is the value of the Acknowledgement field in the  SYNACK segment? What is it in the segment that identifies the segment as a SYNACK  segment? 5. What is the sequence number of the TCP segment containing HTTP POST command? Hints: In order to find the POST command, you will need to dig into the packet content field  at the bottom of the wireshark window

1. Start up your web browser and go to the http://gaia.cs.umass.edu/wireshark-labs/alice.txt and 
retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer
2. Next go to http://gaia.cs.umass.edu/wireshark-labs/TCP-wireshark-file1.html. You will 
find a form to upload the text file.
3. Use the browse button in this form to enter the name of the file on your computer containing 
Alice in Wonderland. Don’t yet press the “Upload alice.txt file” button in the form
4. Now start up Wireshark and begin packet capture.
5. Returning to your browser press the “Upload alice.txt file” button in the form to upload the 
file to the gaia.cs.umass.edu server. Once the file has been uploaded, a short congratulations 
message will be displayed in your browser window.
6. Stop the Wireshark packet capture
Answer the following questions:
1. What is the IP address and TCP port number used by client computer (source) that is 
transferring the file to gaia.cs.umass.edu?
2. What is the IP address of gaia.cs.umass.edu? On what port number is it sending and receiving 
TCP segments for this connection?
3. What is the sequence number of the TCP SYN segment that is used to initiate the TCP 
connection between the client computer and gaia.cs.umass.edu? What is it in the segment that 
identifies the segment as a SYN segment?
4. What is the sequence number of the SYNACK segment sent by gaia.cs.umass.edu to the 
client computer in reply to the SYN? What is the value of the Acknowledgement field in the 
SYNACK segment? What is it in the segment that identifies the segment as a SYNACK 
segment?
5. What is the sequence number of the TCP segment containing HTTP POST command?
Hints: In order to find the POST command, you will need to dig into the packet content field 
at the bottom of the wireshark window
6. What are the sequence numbers of the first six TCP segments? Consider the TCP segment 
that contains HTTP POST as the first segment in the TCP connection.
7. When the acknowledgement for the first TCP segment received? What is the 
acknowledgement number for that acknowledgement? Calculate the RTT value to get this 
acknowledgement.
8. What is the length of each of the first six TCP segments?
Plot the following graph:
Select a TCP segment in the Wireshark’s “listing of captured-packets” window. Then select 
the menu: Statistics-> TCP Stream Graph -> Time-Sequence-Graph(Stevens). Make a plot 
that looks similar to the plot given in part 4 of the “Wireshark_TCP_v8.0.pdf” file uploaded 
in the course content section of Blackboard
Question 9: In the graph each dot represents a TCP segment sent. What is meant by a set of 
dots stacked above each other in the graph?