实验五 探索TCP协议.doc

陕西师范大学　计算机网络　实验报告 实验五 探索TCP协议 一、实验目的 1.熟悉并掌握 wireshark的操作。 2.通过实验分析并掌握TCP是如何进行数据传输的，及其如何实现拥塞控制、流量控制等 二、实验器材 1.PC机电脑一台。 2．下载wireshark软件并安装 三、实验内容 通过实验分析并掌握TCP是如何进行数据传输的，及其如何实现拥塞控制、流量控制等 四、问题回答 1. Capturing a bulk TCP transfer from your computer to a remote Server , 2. A first look at the captured trace 1. What is the IP address and TCP port number used by the client computer (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：client computer (source)： IP address：02 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：2 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 client computer(source) to transfer the file to ? 答：My client computer: IP address:0 3. TCP Basics Answer the following questions ； 4. What is the sequence number of the TCP SYN segment that is used to initiate the TCP connection between the client computer 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 client computer 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 numbe