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Using Information Technology

Chapter 2 – Page 35 - 66The Internet & the World Wide Web

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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

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332.1 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

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Download - to transmit data from a remote computer to a local computer

Upload - to transmit data from a local computer to a remote computer

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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.

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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 MbpsT2 – 6 Mbps

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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

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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 pointsExample,

netvigator, icable etc.

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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

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E-Mail Addresses

Jane_Doe@earthlink.net.uk

User name: Jane_Doe

Domain name: earthlink

Top-level domain: .net

Two-letter country extension: .uk

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Instant Messaging

Instant messaging (IM) - allows any user on a given e-mail system to send a message and have it pop up instantly on the screen of anyone else logged onto that system

Mailing Lists: E-Mail-Based Discussion Groups

List-serves - e-mail mailing lists of people who regularly participate in discussion groups

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Netiquette: Appropriate Online Behavior

Consult FAQs

Emoticons

Avoid flaming Don’t SHOUT!

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Netiquette: Appropriate Online Behavior

Avoid sloppiness but avoid criticizing others’ sloppinessDon’t send huge

file attachments, unless requestedWhen replying,

quote only the relevant portion!

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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

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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

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The Web & How It Works

Website--the domain on the computer

Site - a computer with a domain nameExample: barnesandnobleuniversity.com

Website - the location of a web domain name in a computer somewhere on the Internet

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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: Barnes & Noble University’s Science & Technology Campus

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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 ExplorerNetscape Navigator

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The Web & How It Works

URLs--addresses for web pages

http://www.nps.gov/abli/index.htm

Protocol : http://

Domain name: www.nps.gov

Directory name: abli

File name: index.htm

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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

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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

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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

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Web Portals: Starting Points for Finding InformationWeb portal - website that groups together in one

convenient location popular features such as search tools, e-mail, electronic commerce, and discussion groups

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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

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Four Types of Search Engines

Human-organized search sites

Computer-created search sites

Hybrid search sites

Metasearch sites

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Summary

Bandwidth: telephone line 56K bps, ADSL: 2 Mbps, T1, 1.5 MbpsISP: Internet Service Provider: PCCW, Netvigator, icableBrowser: IE Explorer 6.0, and Netscape 6.0Search Engine: Altavista, Timway (Hong Kong)Portal: Yahoo, Geocities