ITEC1001 Section 1 and 19 August 27, 2007 Notes

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Contents

Chapter 2

Internet

The internet was created because the government needed a more reliable method of sharing information. This military network was called ARPANET, and worked at the same speed as modems today. There were four main computers on this network, and now there are over 350 million servers. No one owns or is responsible for the whole internet, but the World Wide Web Consortium(W3C) consists of almost 400 organizations that set regulations.

The internet consist of local, regional, national, and international networks. The telephone, cable, or satellite company are the internal structure of the internet.

Connecting

The internet can be accessed using one of the following:

  • Dial-up - uses with standard phone line but slow in speed.
  • DSL, digital subscriber line, uses telephone line with high speed
  • Cable - uses cable television network to connect, also is a high speed.
  • Fixed Wireless - uses a dish shape antenna that provides high speed access.
  • Wi-Fi, wireless fidelity, uses radio signal
  • Satellite modem - uses satellite dish.

Access Provider Categories

A business that provides individuals and companies access to the internet for free or a fee

An ISP (Internet service provider) is a regional or national access provider. Regional ISP usually provides Internet access to a specific geographic area.A nation ISP usually provides Internet access in cities and towns nationwide, and offers more services and have larger technical support staff than regional ISP's. AT&T and Worldnet Service and Earthlink are the example of ISP.

Online service provider (OSP) has many member-only features: special content and services such as news, e-mail, photo communities , online calendars, and instant messaging . Example, AOL (American online), MSN (Microsoft network).

Wireless Internet service provider (WISP)-companies that provide wireless Internet access to computers and mobile devices, such as smart phones and PDAs, with built-in-wireless capability or to computers with wireless modems or wireless access devices.

Data Transmission

Computers work together to transfer data and information around the world. The internet backbone is made up of the major carriers of network traffic. In the United States data is exchanged through the networks of several major cities to reach it's final destination.(discovering computers, pg52) Think of it as a long distance flight, you may stop in several airports along the way to the city you are trying to reach depending on the distance.

Internet Addresses

Internet Protocol Address(IP address)- # that uniquely identifies each computer connected to the internet - first part identifies the network and the last part identifies the specific computer being used Domain name - is the text version of an IP address. The components of a domain name are separated by periods. Top-level domain (TLD) - the last section of the domain name. example, com,net,gov, org, etc... (further information shows on figure 2-3 and 2-4)

WWW

World Wide Web- Worldwide connection

  • web page - the electronic document on the web. it contains text, graphics, audio, and video.
  • Web site - the collection of related web pages and associated items, such as documents and pictures, stored on a web server.
  • web server - a computer that delivers.
  • web 2.0 - the web sites that allow users to modify Wed site content, provide a means for users to share personal information, and have application software built into the site for visitors to use.
  • Web browser - an application software that allows users to access and view web pages. Examples, Explore, Firefox, and Netscape.
  • Tabbed browsing - the top of the browser display a tab.

Web address

Unique address for a Web page, also called a URL (Uniform Resource Locator). Web address consists of a protocol, domain name, and sometimes the path of a specific Web page or location on a web page.

Search Engines

Search Engines - Tools used to search the World Wide Web for content such as web pages, images, videos, ect.

Examples: Google, Yahoo, Askjeeves, Dogpile, MSN, Comcast

Types of Web Pages

  • Portal - a web site that offers variety of Internet services from a single location. The web site offers search engine, news, sports, stock quotes, email, and shopping. Popular portals include: AOL,Excite, MSN, Alta Vista, Yahoo, Netscape
  • News - contains articles relating to current events, sports, weather, etc.
  • Entertainment - offer music, videos, games, ex: youtube
  • Blog - keeping an online journal, such as Xanga.com or Blogger.com
  • Informational - a Web site that consist of factual information. Many United States government agencies provide information such as census data, tax codes, and congressional budget on their web site.
  • Business/Marketing - Web site that contains content that promotes or sells products or services.
  • Advocacy - website contains content that describes a cause, opinion, or idea.
  • Wiki - allows users to create or modify a Web site on their own computer.
  • Social networking - a website that encourages members in its online community to share their interest, ideas, stories. (ex. myspace, facebook)
  • Content aggregator--gathers and organizes web content for free or fee. Orbitz is a good one. It organizes flights from all airlines for you.
  • personal - Private individual or family website not usually associated any organization.

Multimedia on the Web

  • Graphics - a digital representation of information. A thumbnail is a good example.
  • Animation - give the appearance of motion through displaying a series of images in sequence.
  • Audio - includes music, speech, or any other sound. For example, MP3 or potcast.
  • Video - consists of full-motion images that are played back at various speeds.
  • Virtual Reality (VR) - the use of computers to simulate a real or imagined environment that appears as a three-dimensional space.

plug-ins - is a program that extends the capability of a browser.

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