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Today (Ch. 1) Explore the structure of the World Wide Web

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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- distance telephone company long- distance telephone company 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 Disadvantages
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 Asymmetric Digital Subscriber Line (ADSL)
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 IP address protocol


25 Web Address (URL) IP address
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 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 , chat rooms, news and sports, etc. Google, MSN, and Yahoo!

30 Types of Web Sites Personal Organizational / Topical Commercial
Limited developmental resources Uses Advertise employment credentials Meet new friends Share common interests Do not post information that can be misused Organization Organization Web sites contain information on particular organizations Topical Web sites contain information on the developer’s interests and hobbies Not all information is accurate Commercial Used to promote and sell a product for a business via the Internet More complex commercial Web sites generally produce greater revenue Obtain product and service information from a company’s marketing department

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 XML uses markups to define the content of a Web page
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 Oversight 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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