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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 The Internet & the World Wide Web Exploring Cyberspace

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Www isp url search the web l.jpg

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


The internet the world wide web exploring cyberspace l.jpg
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.


2 1 choosing your internet access device physical connection the quest for broadband l.jpg
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.


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Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.


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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.


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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.


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Cable Modem: Close Competitor to DSL Most Cities

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.


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2.2 Choosing Your Internet Service Provider (ISP) Most Cities

  • 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.


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2.3 Sending & Receiving E-Mail Most CitiesE-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.


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E-Mail Addresses Most Cities

  • 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.


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Netiquette: Appropriate Online Behavior Most Cities

Avoid flaming

Don’t SHOUT!

  • Consult FAQs

Emoticons

Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.


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Netiquette Most Cities: 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.


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Spam: Unwanted Junk E-Mail Most Cities

  • 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.


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2.4 The World Wide Web Most Cities

  • 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.


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The Web & How It Works Most Cities

  • 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.


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The Web & How It Works Most Cities

  • 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.


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The Web & How It Works Most Cities

  • 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.


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The Web & How It Works Most Cities

  • 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.


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Using Your Browser to Get Around the Web Most Cities

  • 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.


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Using Your Browser to Get Around the Web Most Cities

  • 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.


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Using Your Browser to Get Around the Web Most Cities

  • 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.


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Web Portals: Starting Points for Finding Information Most Cities

  • 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.


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Web Portals: Starting Points for Finding Information Most Cities

  • 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.


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Four Types of Search Engines Most Cities

  • Human-organized search sites

  • Computer-created search sites

  • Hybrid search sites

  • Metasearch sites

Copyright © 2003. Exclusive rights by The McGraw-Hill Companies, Inc.


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Summary Most Cities

  • 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.


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