Chapter Ten. From Internet to Information Superhighway
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1 Chapter Ten From Internet to Information Superhighway
2 After reading this chapter you should be able to: Describe the nature of the Internet and the variety of functions it performs Discuss several software tools for navigating and using the Internet effectively 1999 Addison Wesley Longman 10.2
3 After reading this chapter you should be able to: Explain how the Internet and other telecommunication technologies are evolving into an information superhighway Discuss the future of the Internet in particular and cyberspace in general 1999 Addison Wesley Longman 10.3
4 Chapter Outline The Internet: A Network of Networks Communication Applications Information Exploration Applications The World Wide Web The Evolving Internet 1999 Addison Wesley Longman 10.4
5 The Internet: A Network of Networks The Internet is an interconnected network of thousands of networks linking academic, research, government, and commercial institutions Addison Wesley Longman 10.5
6 Internet Services The Internet provides scientists, engineers, educators, students, business people, and others with a variety of services such as: Electronic mail (send/receive mail messages) Remote login (Telnet - access to other computers 1999 Addison Wesley Longman 10.6
7 Internet Services Transferring files (FTP - accessing archives of data) Newsgroups (Usenet - on-line public discussions) World Wide Web (a collection of multimedia documents) 1999 Addison Wesley Longman 10.7
8 Counting Connections Today, the Internet connects computers to about every country in the world. However, the Internet is: growing too fast to measure its growth too decentralized to quantify a network with no hard boundaries 1999 Addison Wesley Longman 10.8
9 Internet Protocols TCP/IP (Transmission Control Protocol/Internet Protocol) is the protocol at the heart of the Internet Addison Wesley Longman 10.9
10 Internet Protocols TCP/IP translates into: TCP (transmission control protocol) breaks messages into packets. IP (Internet protocol) is the addressing for the packets Addison Wesley Longman 10.10
11 Internet Protocols TCP/IP specifications were published with open standards, not owned by any company Addison Wesley Longman 10.11
12 Internet Access Options Direct (dedicated) connection: computer has an IP address and is attached to a LAN Addison Wesley Longman 10.12
13 Internet Access Options Dial-up terminal emulation: temporary, limited connection using a modem. Full-access dial-up: uses SLIP or PPP via modem Addison Wesley Longman 10.13
14 Intranets and Extranets Intranets - self-contained intraorganizational networks that are designed using the same technology as the Internet. Firewalls - used to prevent unauthorized communication and secure sensitive internal data Addison Wesley Longman 10.14
15 Intranets and Extranets Typical intranets include Newsgroups File transfer Web Publishing Other services 1999 Addison Wesley Longman 10.15
16 Intranets and Extranets Extranets - are designed for outside use by customers, clients, and business partners of the organization. Electronic Commerce - business transactions through electronic networks Addison Wesley Longman 10.16
17 Intranets and Extranets Electronic data interchange (EDI) - a decade-old set of specifications for ordering, billing, and paying for parts and services over private networks. Virtual private networks - not subject to the traffic and security problems Addison Wesley Longman 10.17
18 Communication Applications: The UNIX Connection The user interface varies depending on which client/server application is being used. UNIX - developed by Bell Labs, allows a timesharing computer to communicate with several other computers or terminals at once Addison Wesley Longman 10.18
19 The UNIX Connection UNIX is the dominant operating system on the Internet, and the DOS-like character-based interface is still widely used on Internet hosts Addison Wesley Longman 10.19
20 Internet Addresses An Internet address is made up of two parts separated by symbol: the person s user name the host name The host is named using DNS (domain name system), which translates IP addresses into a string of names Addison Wesley Longman 10.20
21 Internet Addresses An Internet address includes: username is the person s mailbox hostname is the name of the host computer and is followed by one or more domains separated by periods: host.subdomain.domain host.domain host.subdomain.subdomain.domain 1999 Addison Wesley Longman 10.21
22 Internet Addresses Top level domains include:.edu - educational sites.com - commercial sites.gov - government sites.mil - military sites.net - network administration sites.org - nonprofit organizations 1999 Addison Wesley Longman 10.22
23 on the Internet (one-on-one communication). Pine - UNIX-based mail program. MIME - Multipurpose Internet Mail Exchange - allows you exchange files through Addison Wesley Longman 10.23
24 Mailing Lists and Newsgroups is a valuable tool for one-to-one communication Mailing lists allow you to participate in discussion groups on specialinterest topics. Usenet Newsgroups are virtual bulletin boards that you access with a news reader 1999 Addison Wesley Longman 10.24
25 Real-Time Communication Talk is a UNIX program that allows you to carry on a split-screen communication Internet relay chat (IRC) allows several users to type simultaneously Multi-User Domains (MUD) are real-time group adventure games 1999 Addison Wesley Longman 10.25
26 Real-Time Communication Video telephony (see, hear, and type to another person). MBONE - Multicase Backbone - exchange of audio and video material over the Internet Addison Wesley Longman 10.26
27 Information Exploration Applications The most popular use of the Internet is information discovery and retrieval. Because the Internet is unorganized, you can use the following tools: Telnet: for remote login to other computers. FTP: file transfer protocol; transfer files from remote computers Addison Wesley Longman 10.27
28 Information Exploration Gopher, Archie, Veronica, and WAIS: simple interfaces for file retrieval. World Wide Web: most popular system for exploring information. Applications 1999 Addison Wesley Longman 10.28
29 The World Wide Web: Browsing the Web WWW is a distributed browsing and searching systems developed by CERN. Use hypertext links and navigational aids to explore information on the Internet Addison Wesley Longman 10.29
30 Web Addresses URL (Uniform Resource Locator): addresses for the World Wide Web. http (hypertext transfer protocol): the protocol of the WWW 1999 Addison Wesley Longman 10.30
31 Searching the Web A directory (also an index) is a hierarchical catalog of Web sites compiled by researchers Addison Wesley Longman 10.31
32 Searching the Web A search engine offers a more complete database of what is one the WWW. A software robot or spider retrieves the entries according to key word queries Addison Wesley Longman 10.32
33 Publishing on the Web HTML (HyperText Markup Language) document includes format, layout, and logical structure of a hypermedia document that will be published on the WWW Addison Wesley Longman 10.33
34 Publishing on the Web An example would be: <H1>Welcome to Computer Confluence</H1> <b>publishing on the Web</b> 1999 Addison Wesley Longman 10.34
35 From Hypertext to Multimedia Typical web pages can contain: Tables Frames Forms Streaming audio and video Real-time live audio or video 3-D environments 1999 Addison Wesley Longman 10.35
36 Beyond HTML Dynamic HTML - adds more programming power to HTML by allowing code to automatically modify itself under certain circumstances. XML - will be replace HTML plus provide additional features and extensions Addison Wesley Longman 10.36
37 Beyond HTML VRML (virtual reality modeling language): creates 3-D virtual worlds. Java: an objectoriented programming language for the World Wide Web Addison Wesley Longman 10.37
38 The Evolving Internet The commercialization of the Internet has open a floodgate of new services to users. The Internet is being used for about any purpose - sports scores, purchasing books, medical research, and subscribe to electronic magazines to name only a few Addison Wesley Longman 10.38
39 The Road to the Information Superhighway People are using the terms information superhighway and Internet interchangeably. This terrain of electronic pulses is commonly referred to as Cyberspace Addison Wesley Longman 10.39
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