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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.

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Presentation on theme: "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."— Presentation transcript:

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

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 telephone company long- distance telephone company local telephone company local access area 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 browsers 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 protocol IP address protocol domain name


25 Web Address (URL) Protocol Machine name Domain name Folder on Web server filename File extension IP address

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 users hand –Personal Digital Assistant (PDA)

27 Search Engines / Portals Software programs that find Web sites and Web pages Enter a keyword into a search engines 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 – , 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 ) –Due on 2/15 Reading assignments –Shelly Ch. 1 Checkpoint –Carey, Ch. 1 for Basic HTML

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