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College of Information Sciences and Technology Networking and Telecommunications: Wireshark TCP ©Copyright 1999-2015 | The Pennsylvania State University, College of Information Sciences and Technology Page 6 Since this lab is about TCP rather than HTTP, let’s change Wireshark’s “listing of captured packets” window so that it shows information about the TCP segments containing the HTTP messages, rather than about the HTTP messages. To have Wireshark do this, select Analyze->Enabled Protocols. Then uncheck the HTTP box and select OK . You should now see a Wireshark window that looks like: This is what we are looking for – a series of TCP segments sent between your computer and 192.168.0.5. We will use the packet trace that you have captured to study TCP behavior in the rest of this lab.
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College of Information Sciences and Technology Networking and Telecommunications: Wireshark TCP ©Copyright 1999-2015 | The Pennsylvania State University, College of Information Sciences and Technology Page 7 Answer the following questions: 2. What is the sequence number of the TCP SYN segment that is used to initiate the TCP connection between the client computer and 192.168.0.5? What is it in the segment that identifies the segment as a SYN segment? Include a screenshot to justify your answer. 3. What is the sequence number of the SYNACK segment sent by 192.168.0.5 to the client computer in reply to the SYN? What is the value of the ACKnowledgement field in the SYNACK segment? How did 192.168.0.5 determine that value? What is it in the segment that identifies the segment as a SYNACK segment? Include a screenshot to justify your answer. 4. What is the sequence number of the TCP segment containing the HTTP POST command? Note that in order to find the POST command, you’ll need to dig into the packet content field at the bottom of the Wireshark window, looking for a segment with a “POST” within its DATA field. Include a screenshot to justify your answer. 5. Consider the TCP segment containing the HTTP POST as the first segment in the TCP connection. What are the sequence numbers of the first six segments in the TCP connection (including the segment containing the HTTP POST)? At what time was each segment sent? What is the Estimated RTT value for each segment? Note: Wireshark has a nice feature that allows you to plot the RTT for each of the TCP segments sent. Select a TCP segment in the “listing of captured packets” window that is being sent from the client to the 192.168.0.5 server. Then select:
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  • Spring '16
  • Transmission Control Protocol, Pennsylvania State University, Information Sciences, College of Information Sciences and Technology

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