计算机网络实验3TCP实验.doc

计算机网络实验报告三
TCP实验
1. What is the IP address and TCP port number used by the puter (source)
that is transferring the file to ? To answer this question, it’s
probably easiest to select an HTTP message and explore the details of the TCP
packet used to carry this HTTP message, using the “details of the selected packet
header window”(refer to Figure 2 in the “Getting Started with Wireshark” Lab if
you’re uncertain about the Wireshark windows).
答:puter (source):IP address: TCP port number:1161
2. What is the IP address of ? On what port number is it sending
and receiving TCP segments for this connection?
答:the IP address of :IP address: port number:80
3. If you have been able to create your own trace, answer the following question:What is the IP address and TCP port number used by your puter(source) to transfer the file to ?
答:My puter:
IP address:
4. What is the sequence number of the TCP SYN segment that is used to initiate theTCP connection between the puter and ? What is it in the segment that identifies the segment as a SYN segment?
答:sequence number:0 ;syn 被设置为1说明是syn段。
5. What is the sequence number of the SYNACK segment sent by
to the puter in reply to the SYN? What is the value of the ACKnowledgement field in the SYNACK segment? How did determine that value? What is it in the segment that identifies the segment as a SYNACK segment?
答:The sequence number of the SYNACK segment sent by is:0;
SYNACK segment 中 ACKnowledgement 的值为1;
ACKnowledgement number的值为SYN消息中sequence number加上1所得;
SYN 和Acknowledgement f都置为1说明这是一个SYNACK segment.
6. What is the sequence number of the TCP segment containing the HTTP POST
command? Note that in order to find the mand, you’ll need to dig into
the packet content field at the bottom of the Wireshark window, looking for a
segment with a “POS