Chats A- A ACKnowledgement field in the SYNACK segment? How did gaia.cs.umass.ed

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Chats A- A 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? 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 shut off the TCP filter from earlier, and dig into the packet content field at the bottom of the WireShark window, looking for a segment with a "POST" within its DATA field. 4. 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 and the first five Continuation messages after it)? These are HTTP protocol messages, and you're looking in the TCP portion of them. You can omit the first four digits of each ACK, since that probably won't change during the transmission Ifyou don 't have Continuation messages, use the HTTP POST and the first five reassembled packets it cites in the example in section 1, the POST command is packet #749, and the packets are 254, 334, 335, 336, and 350, The Info field for the packets might read "[TCP segment of a reassembled PDU]" At what time was each segment sent? When was the ACK for each segment received? The ACKs are TCP Protocol messages, with Info starting 'http > sourceportnumber ACK], where sourceportnumber is the port number of the client HTTP connection. Your Info field might differ in format, but it should say [ACK] somewhere! Match

Explanation / Answer

Wireshark dump pacp trace files consists of http application protocols along IP,TCP and HTTP Post hex packets

1.] As per attached trace

    Source Address IPv4: 129.25.18.40 ,Source Port : 3657

     Destination Address IPv4 : 128.119.245.12 , Destination port: 80

2.] Sequence number of TCP SYN segment = 152134

      Segment as SYN -- when SYN flag is set (1) in the wireshark TCP trace

3]   Sequence number of TCP SYNACK segment = 152134

      Identification of SYNACK segement-- when SYN and ACK flags are set (1) in the wireshark TCP trace

4] Sequence number of HTTP Post .When opened the http trace .. sequence number is unique mentioned(3480809230). in the

10.] Throughput = Total tcp data packets/ Total time

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