1. Topic
Write out the information interaction process when visiting the homepage Http://www.school.edu.cn/welcome.htm.
2. Answer
(1) Analyze the URL of the page pointed to by the hyperlink: <http://www.school.edu.cn/welcome.htm>
(2) The client applies to the DNS server for domain name resolution, and the DNS server will query the web server www. The IP xxx.xxx.xxx.xx address of shcool.edu.cn is passed to the client.
(3) IE makes a TCP connection with the server whose IP address is xxx.xxx.xxx.xx, and the port is 80;
(4) IE implements the HTTP protocol, sends the GET /welcome.htm command, and requests to read the file;
(5) www.school.edu.cn server returns /welcome.htm file to the client;
(6) welcome.htm transmission ends, both parties agree to release the TCP connection;
(7) IE interprets the content of /welcome.htm file and displays the file page.
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