WWW, ISP, URL, Search the Web

1. WWW, ISP, URL, Search the Web Chapter 2 – Page 35 – 66 of Textbook using Information Technology by Williams and Sawyer, fifth edition, ISBN 0-07-115105-2

2. The Internet & the World Wide WebExploring Cyberspace • 2.1 Choosing Your Internet Access Device & Physical Connection: The Quest for Broadband • 2.2 Choosing Your Internet Service Provider (ISP) • 2.3 Sending & Receiving E-Mail • 2.4 The World Wide Web • 2.5 The Online Gold Mine: More Internet Resources, Your Personal Cyberspace, E-Commerce, & the E-conomy Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

3. 2.1 Choosing Your Internet Access Device & Physical Connection: The Quest for Broadband • Bandwidth - an expression of how much data can be sent through a communications channel in a given amount of time • Broadband - very high speed connection Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

4. Download - to transmit data from a remote computer to a local computer • Upload - to transmit data from a local computer to a remote computer Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

5. Telephone (Dial-Up) Modem: Low Speed but Inexpensive & Widely Available • Modem - device that sends and receives data over telephone lines to and from computers • Most modems today have a maximum speed of 56 Kbps. Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

6. High-Speed Phone Lines: More Expensive but Available in Most Cities • ISDN - hardware and software that allows voice, video, and data to be communicated over traditional copper-wire telephone lines, up to 128K bps • DSL - also uses regular phone lines but much faster than ISDN, could be up to 2 Mbps • T1 - a traditional trunk line that carries 24 normal telephone circuits and has a transmission rate of 1.5 Mbps • T2 – 6 Mbps Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

7. Cable Modem: Close Competitor to DSL Cable modem - connects a personal computer to a cable-TV system that offers an Internet connection Wireless Systems: Satellite & Other Through-the-Air Connections Satellite Radio waves between cellular towers Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

8. 2.2 Choosing Your Internet Service Provider (ISP) • ISP - a company that connects you through your communications line to its servers, or central computer, which connect you to the Internet via another company’s network access points • Example, netvigator, icable etc. Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

9. 2.3 Sending & Receiving E-MailE-Mail Software & Carriers • Buy e-mail software • Get e-mail program as part of other computer software (such as browser) • Get e-mail software as part of your ISP package • Get free e-mail services Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

10. E-Mail Addresses • dcykcho@cityu.edu.hk • User name: dcykcho • Domain name: cityu • Top-level domain: .edu • Two-letter country extension: .hk Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

11. Netiquette: Appropriate Online Behavior Avoid flaming Don’t SHOUT! • Consult FAQs Emoticons Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

12. Netiquette: Appropriate Online Behavior • Avoid sloppiness but avoid criticizing others’ sloppiness • Don’t send huge file attachments, unless requested • When replying, quote only the relevant portion! Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

13. Spam: Unwanted Junk E-Mail • Delete without opening the message • Never reply to a spam message! • Enlist the help of your ISP or use spam filters • Fight back Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

14. 2.4 The World Wide Web • Q: What makes the Web graphically inviting? • A: Multimedia • Q: What makes the Web easily navigable? • A: Hypertext HTML & resulting page Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

15. The Web & How It Works • Website--the domain on the computer • Site - a computer with a domain name • Example: cityu • Website - the location of a web domain name in a computer somewhere on the Internet Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

16. The Web & How It Works • Web pages--the documents on a website • Web page - a document on the WWW that can include text, pictures, sound, and video • Example: City University of Hong Kong CityU Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

17. The Web & How It Works • Browsers--software for connecting with websites • Web browser - software that enables users to view web pages and to jump from one page to another • Best-known browsers: • Microsoft’s Internet Explorer • Netscape Navigator Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

18. The Web & How It Works • URLs--addresses for web pages • http://personal.cityu.edu/~dcykcho//index.htm • Protocol : http:// • Domain name: personal.cityu.edu.hk • Directory name: ~dcykcho • File name: index.htm Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

19. Using Your Browser to Get Around the Web • Home page - the first page you see when you start up your browser • Getting around: • Back - takes you back to the previous page • Forward - takes you to a page you returned from • Home - takes you to your home page Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

20. Using Your Browser to Get Around the Web • History list - list accessible from browser’s toolbar that allows you to return to a page you have recently visited • Bookmarks or favorites - your favorite URLs stored in a list to permit frequent visits without retyping the URLs • Simultaneous viewing of two pages via File menu’s “New” item Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

21. Using Your Browser to Get Around the Web • Interactivity--hyperlinks, radio buttons, and fill-in text boxes • Radio buttons - little circles located in front of various options; selecting an option with the mouse places a dot in the corresponding circle Radio buttons and textbox Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

22. Web Portals: Starting Points for Finding Information • Web portal - website that groups together in one convenient location popular features such as search tools, e-mail, electronic commerce, and discussion groups Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

23. Web Portals: Starting Points for Finding Information • After logging on, you can: • Check the home page for general info • Use the directories to find a topic • Use keyword to search for a topic Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

24. Four Types of Search Engines • Human-organized search sites • Computer-created search sites • Hybrid search sites • Metasearch sites Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.

25. Summary • Bandwidth: telephone line 56K bps, ADSL: 2 Mbps, T1, 1.5 Mbps • ISP: Internet Service Provider: PCCW, Netvigator, icable • Browser: IE Explorer 6.0, and Netscape 6.0 • Search Engine: Altavista, Timway (Hong Kong) • Portal: Yahoo, Geocities Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.