Retrieving Internet chat history with the same ease as a squirrel ...
Chapter 2 The Internet and the World Wide Web. 2 Objectives Brief history Internet Access Six...
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Transcript of Chapter 2 The Internet and the World Wide Web. 2 Objectives Brief history Internet Access Six...
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Objectives
• Brief history• Internet Access• Six Internet Services
– Web
– Chat (instant messenger)
– Newsgroup
– FTP
– Telnet
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History of Internet
• 30-year History since 1969– Pentagon and Cold War
• Original Use: – Military installations
– Universities
– Business firms with defense department contracts
• Initial Goal: – Design a network that maintains the safe
transition of data between military computers
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EventsDate Event
1969 ARPAnet (Advanced Research Projects Agency )
1984 MILNET & ARPANET (Internet)
1980s National Science Foundation (NSF) controlled Internet Access
1991 NSF eased restrictions on Internet Access
1995 U.S. government relaxed entry into Internet for the public
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Internet Service Providers
• ISPs offer:– Linking consumers and businesses
to Internet– Monitoring and maintaining a
customer’s Web site– All Internet Services
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Web
• World Wide Web (WWW)– Global hypertext network of
millions of Web servers and browsers
– Connected by Hypertext Transfer Protocol (HTTP)
– Web pages can be designed by Hypertext Markup Language (HTML)
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Web (Cont’d)• Uniform Resource Locator (URL)
– E.g. http://www.towson.edu
– http:// - protocol designer
– www.towson.edu - server name• www means the network is located on a
dedicated Web server somewhere
• Towson.edu is the name of the network
• edu indicates the site is an educational institution
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• Email client– A software program loaded in a
PC allowing user to access email
• Email Server
• Email protocol: SMTP (Simple Mail Transfer Protocol)
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Instant Messenger/Chat
• Industrial Examples (AOL, MSN)
• Relevance to Internet usages: distinguish Web from Internet
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Telnet and FTP
• Telnet– A basic Internet service
allowing users to access remote computers
• File Transfer Protocol (FTP)– A standard protocol
allowing users to copy files from computer to computer on Internet
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Exercises
• What are the 6 types of Internet services?• What is the software called that allows users to
navigate the Web, a browser or HTTP?• True/False? The main network of connections that
carry Internet traffic is called the Intranet? Or backbone?
• True/False? A location on the Web that acts as a launching point for searching and retrieving information is called a portal or homepage.
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Summary• Brief history• Internet access• Internet services
– Web– Email– Messenger/Chat– FTP– Telnet– Newsgroup