Today (Ch. 1)

1. Today (Ch. 1) • Explore the structure of the World Wide Web • Learn the basic principles of Web documents • Describe an Internet service provider • Identify Web design browser-related issues • Describe the different Web page viewing devices available • Identify the different types of Web sites

2. The Development of the World Wide Web • In 1989, Timothy Berners-Lee and other researchers at the CERN nuclear research facility, laid the foundation of the World Wide Web, or the Web. • created an information system that would make it easy for researchers to locate and share data • required minimal training and support • developed a system of hypertext documents, electronic files that contain elements that you can easily select

3. The Internet and the World Wide Web • The Internet is a worldwide collection of networks, each of which is composed of a collection of smaller networks • A network is composed of several computers connected together to share resources and data

4. The Internet The World Wide Web Hart & Geller (2003), New perspectives on Macromedia Dreamweaver MX. Course Technology

5. The Internet and the World Wide Web • The World Wide Web (WWW or Web) is a graphical interface that utilizes the Internet to distribute and retrieve information • A Web site is a collection of linked Web pages • Starts with a home page • Pages are linked together with a hyperlink, or link • Surfing the Web

6. Accessing Information on the Web • Users access Web sites through the public switched telephone network (PSTN) • Worldwide telephone system that handles voice-oriented phone calls • Integral part of computer communications • Network mostly uses digital technology

7. Accessing Information on the Web local access area local access area local telephone company local telephone company long-distancetelephonecompany long-distancetelephonecompany telephone service customer telephone service customer

8. Dial-Up Lines • A dial-up line is a temporary connection that uses one or more analog phone lines • Requires a modem on each end of the connection • Communication ends when either modem hangs up

9. Dial-Up Lines • Advantages • Costs no more than a regular phone call • Computers at any two locations can establish a connection using a modem and telephone network • Disadvantages • Cannot control quality of connection • Slow transfer rates

10. Dedicated Lines • A dedicated line is a connection that always is established between two communications devices • Can be analog or digital • Quality, consistency, and speed of the connection are better than a dial-up line • Businesses often use dedicated lines

11. Dedicated Lines • Three popular types of digital dedicated lines • ISDN lines • Digital Subscriber Lines • T-carrier Lines

12. ISDN Lines • Integrated Services Digital Network • ISDN allows a single telephone line to carry three or more signals (multiplexing) • Faster than dial-up

13. DSL • Digital Subscriber Line • Transmits at fast speeds on existing standard copper telephone wiring • Some installations can also provide a dial tone • Asymmetric Digital Subscriber Line (ADSL) • Faster to receive data than to send data • Ideal for Internet users

14. T-carrier Lines • Any of several types of digital lines that carry multiple signals over a single communications line • Extremely fast data transfer rates • T1 Line • Most popular T-carrier line • Fractional T1 • T3 Line • Equivalent to 28 T1 lines • Internet backbone uses T3 lines

15. Cable Television Lines • Allows users to connect to the Internet through their cable line • Rapid transfer rates using a cable modem connected to a CATV line

16. Fixed Wireless • Internet connectivity for users who do not have access to services such as DSL or cable • Satellite technology used instead of telephone lines • Radio signals provide high-speed connection

17. Service Providers

18. Selecting a Service Provider • Internet Service Provider (ISP) • Has permanent Internet connection • Provides temporary connections free or for a fee • Point of Presence • Regional ISP • National ISP • Earthlink and PeoplePC online

19. Service Providers • Online Service Provider (OSP) • Supplies Internet access and members-only features • News, weather, financial data, games, travel guides • America Online and The Microsoft Network • Fees are slightly higher for an OSP than ISP

20. Service Providers • Wireless Service Provider (WSP) • Company that provides wireless Internet access to users with wireless modems or Web-enabled handheld computers or devices • AT&T Wireless, SprintPCS • Bluetooth is a short-range wireless connection that utilizes radio frequency to transmit data between two electronic devices

21. Web Browsers • A Web browser is a specific software program required to display Web pages

22. Web Browsers • Access Web pages by entering its Uniform Resource Locator (URL) into the Web browser’s address bar • URL is comprised of the protocol, followed by the domain name • Hypertext Transfer Protocol • Domain name can be an IP address or a text version of this address

23. Web Browsers domain name protocol http://pucinfo.calumet.purdue.edu http://205.216.71.230 IP address protocol

25. Web Address (URL) http://www.oswego.edu/library/index.html IP address 129.3.1.100 Protocol Machine name Domain name Folder on Web server filename File extension

26. Alternative Web Page Viewing Devices • Smart phones • Can be used as a regular cell phone and offer e-mail and Web access • Handheld computers • Wireless, portable computers designed to fit in a user’s hand • Personal Digital Assistant (PDA)

27. Search Engines / Portals • Software programs that find Web sites and Web pages • Enter a keyword into a search engine’s text box to locate a Web page about a particular topic • Directories classify Web pages into various categories

28. Search Engines / Portals • Search services create their own Web site databases in different ways • Spiders or robots • Meta tags • Special tags added to Web pages containing information on content

29. Search Engines / Portals • Portals are web sites that offer more than just search services • E-mail, chat rooms, news and sports, etc. • Google, MSN, and Yahoo!

30. Types of Web Sites • Personal • Organizational / Topical • Commercial

31. Tools for Creating Web Pages • Hypertext Markup Language (HTML) • eXtensible Markup Language (XML), eXtensible HTML (XHTML), and Wireless Markup Language (WML) • Cascading Style Sheets • Scripting Languages

32. Hypertext Markup Language • Formatting language used to create Web pages • Defines a Web page through tags or markups • World Wide Web Consortium (W3C) sets standards for HTML and HTTP

33. eXtensible Markup Language (XML), eXtensible HTML (XHTML), and Wireless Markup Language (WML) • XML uses markups to define the content of a Web page • XHTML is a markup language that is a combination of the features of XML and HTML • WML is a subset of XML • Used to design Web pages for microbrowsers

34. Cascading Style Sheets (CSS) • Control the presentation of the content by applying styles to such elements • Type • Margins • Positioning • Colors

35. Scripting Languages • Short programs that your visitors’ browsers run • Browsers must support this technology • Javascript • Active Server Pages (ASP) • Hypertext Preprocessor (PHP) • MySql

36. WYSIWYG • Packages that automatically generate HTML code • There are packages available for every level of expertise • Microsoft FrontPage • Macromedia Dreamweaver • Adobe Go Live

37. Web Design Roles • Web design can be done independently or with a partner or group • Creative Role • Content writer / editor • Web page designer • Web artist / graphic designer • Multimedia producer

38. Web Design Roles • Hi-Tech Role • Web programmer • Database developer • Network / security administrator • Oversight Role • Content managers • Content management system

39. For Next Monday • Lab Class (#322 Snygg) • Bring your textbooks in class and do Tutorial 1 (Case #3 p. 15) and Tutorial 2 (Case #3, pp. 98-99) • Due on 2/15 • Reading assignments • Shelly Ch. 1 Checkpoint • Carey, Ch. 1 for Basic HTML