Number 1
Project 2 (Due date: March 7,2019) Start up your web browser. Go to http://gaia.cs.umass.edu/wiresharklabs/alice.txt and retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer. Next go to http://gaia.cs.umass.edu/wireshark labs/TCP-wireshark-file1.html. Start packet capturing with Wireshark and then upload the file as the webpage instructs. Once the file is uploaded stop capturing Instructions: Explain all your answers by showing trace data (whenever possible) and do not simply answer with a yeso or by giving a number. 1. What is the IP address and TCP port number used by your client computer (source) to transfer the file to gaia.cs.umass.edu? Show a screenshot of how you filter packets from the wireshark field "Filter." so that you see this specific TCP transaction only. Show screen capture of the packets. 2. 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? 3. 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? How did gaia.cs.umass.edu determine that value? What is it in the segment that identifies the segment as a SYNACK segment? 4. What is the length of each of the first six TCP segments? 5. What is the minimum amount of available buffer space advertised at the receiver for the entire trace? Does the lack of receiver buffer space ever throttle the sender? answer this question? Explain how the idea of pipelining is visible in this trace Statistics->TCP Stream Graph-> Time-SequenceGraph(Stevens). Capture the plot and paste it in your 6. Are there any retransmitted segments in the trace file? What did you check for (in the trace) in order to 7. How does the receiver acknowledge segment reception with the ACKs? Does it ACK each data segment? 8. Select a TCP segment in the Wireshark's "listing of captured-packets" window. Then select the menu report. How does the sequence numbers behave over time? Why do you observe this behavior? 9. Calculate the throughput of the TCP connection and epxlain. Project 2 (Due date: March 7,2019) Start up your web browser. Go to http://gaia.cs.umass.edu/wiresharklabs/alice.txt and retrieve an ASCII copy of Alice in Wonderland. Store this file somewhere on your computer. Next go to http://gaia.cs.umass.edu/wireshark labs/TCP-wireshark-file1.html. Start packet capturing with Wireshark and then upload the file as the webpage instructs. Once the file is uploaded stop capturing Instructions: Explain all your answers by showing trace data (whenever possible) and do not simply answer with a yeso or by giving a number. 1. What is the IP address and TCP port number used by your client computer (source) to transfer the file to gaia.cs.umass.edu? Show a screenshot of how you filter packets from the wireshark field "Filter." so that you see this specific TCP transaction only. Show screen capture of the packets. 2. 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? 3. 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? How did gaia.cs.umass.edu determine that value? What is it in the segment that identifies the segment as a SYNACK segment? 4. What is the length of each of the first six TCP segments? 5. What is the minimum amount of available buffer space advertised at the receiver for the entire trace? Does the lack of receiver buffer space ever throttle the sender? answer this question? Explain how the idea of pipelining is visible in this trace Statistics->TCP Stream Graph-> Time-SequenceGraph(Stevens). Capture the plot and paste it in your 6. Are there any retransmitted segments in the trace file? What did you check for (in the trace) in order to 7. How does the receiver acknowledge segment reception with the ACKs? Does it ACK each data segment? 8. Select a TCP segment in the Wireshark's "listing of captured-packets" window. Then select the menu report. How does the sequence numbers behave over time? Why do you observe this behavior? 9. Calculate the throughput of the TCP connection and epxlain
