1、SSD1: Introduction to Information Systems,Unit 1: Using the Web,Wang LISS, Wuhan University,2,The World Wide Web,Introduce the World Wide Web and its workings. Using the Web Whats in the Web? Introduction to HTML Forms and Servlets,3,1.1 Using the Web,Surfing the Web Your Web Pages Clients, Servers, 。

2、 and URLs Searching the Web Commerce on the Web Some Ethical Considerations,4,Surfing the Web,Internet World Wide Web Surfing Internet Service Provider ( ISP ),5,Internet,Internet is a computer network that connects millions of computers across a number of countries. There is no central authority th 。

3、at controls the Internet;
different organizations own different pieces of it.,6,History of the Internet,The Internet comes from ARPAnet created by the U.S. Defense Advanced Internet Research Projects Agency (DARPA) in 1969. In 1983, ARPAnet split into ARPAnet and military MILNET, they are referred t 。

4、o as the early Internet backbone network. This year in January, Transport Control Protocol/Internet Protocol (TCP/IP) officially become the standard protocol for ARPAnet.,7,History of the Internet,In 1985, the National Science Foundation (NSF) provided huge amounts of money to build the five superco 。

5、mputing centers. In 1987, NSF established its own computer network NSFnet based on TCP/IP protocol. In 1990, NSFnet completely replaced the ARPAnet and becomes Internet backbone. In 1995, the Internet began large-scale commercial application in the field.,8,Characteristics of the Internet,A network。

6、of networks Informative and resourceful Fast and convenient Endless online activities Information diversity ,9,The main Internet service,WWW (World Wide Web) WWW is used for Information collection and releasing Users can manipulate the mouse to find hypertext, hypermedia document provided by all sit 。

7、es built on WWW servers.,10,The main Internet service,WWW,11,The main Internet service,E-mail (Electronic mail) E-mail was one of the first uses of the Internet and is still the most popular use. E-mail system uses SMTP protocol to send e-mail from the users computer to the mail server. E-mail syste 。

8、m uses the POP3 protocol to transfers the message from the mail server to the user. E-mail messages can send non-text files, such as graphic images and sound files, as attachments sent in binary streams,12,The main Internet service,E-mail,13,The main Internet service,FTP (File Transfer Protocol) FTP 。

9、 is the primary means of getting files from the remote host on the Internet When the file is sent from client to a remote host, known as the “file upload” (Upload);
otherwise, known as the File Download (Download). Transferred files can be text files, executable files, sound files, image files, data 。

10、 compression files.,14,The main Internet service,Telnet Telnet is a network protocol used on the Internet or local area networks to provide a bidirectional interactive communications facility via a terminal connection. User logs on to another host via a virtual terminal connection and enjoys the res 。

11、ources and services provided by the host.,15,World Wide Web,What is WWW ? WWW (or “the web”) refers to that portion of the computers on the Internet that can communicate with each other using a computer-network protocol called HTTP. WWW is a system of interlinked hypertext documents with client-serv 。

12、er model,16,World Wide Web,Three elements of WWW Unified resource naming :Uniform Resource Locator (URL) Unified resource accessing：Hypertext Transfer Protocol (HTTP) All browsers use HTTP to request and receive Web pages from other computers. Unified information Organization ：HyperText Markup Langu 。

13、age (HTML),17,World Wide Web,Characteristics of WWW Distributed information resources Unified user interface Web browser：IE (MS)；Safari (Apple) ;
Chrome (Google);
Firefox (Mozilla) Supports a variety of media resources Text, Photo, Voice, Video Searching and publishing information Client-Server mode 。

14、l Web Brower, Web Server,18,Surfing,To surf web effectively, efficient search required. Webpage, Website refer to the locations on web that can be visited through a browser. Two major areas of control on the web: naming of website rules of Internet Service Provider (ISP) No organization responsible。

15、for content on the web,19,Other notes on the web,Web Security: one of the major areas of concern for web transactions and personal information hosted on the web “Caveat Emptor” and “Buyer Beware” : important rules for web surfers. Search Engines used to search any informaion on the web using keyword 。

16、s,20,Internet Service Provider ( ISP ),An ISP is any one of a number of companies that enable people not only to connect to the Internet and surf the Web but also to publish Web pages. IAP (Internet Access Provider) ，ICP (Internet Content Provider) 。
,21,Your Web Pages,“Reasonable” Person Principle -W 。

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标题：[计算机软件及应用]计算机与网络