chapter 7_the internet

7/30/2019 Chapter 7_The Internet

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THE INTERNET


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LEARNING OBJECTIVES

After completing this chapter you will be able to:

Introduce the concept of the Internet

Describe the Internet connection components

Describe WWW and its use

Introduction to Internet Navigation

Web Browsers

Web Addresses

Web Search Engines

Evaluating Websites

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WHATISTHE INTERNET?

Is a global network of interconnected computers that

allows users to access and transfer information

remotely.

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WHYWASTHE INTERNETCREATED?

The concept of Internet was developed while the US

was in the mid of cold war with Soviet Union.

Established a secure form of military communication.

Creating a means by which all computers could

communicate.

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INTERNET CONNECTION COMPONENTS

Personal Computers

Internet Service Provider (ISP)

Modem- Internal/External model or WirelessFixed line

Dial up

Broadband

Cable, DSL, FIOS

Wireless Technologies

Municipal WiFi, satellite, and 3G/4G cellular service

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THE WORD WIDE WEB

The World Wide Web, abbreviated as WWW and commonlyknown as the Web, is a system of interlinkedhypertext/hypermedia documents accessed via the Internet.

Hypertext is text displayed on a computer or other electronicdevice with references (hyperlinks) to other text that the readercan immediately access, usually by a mouse click or keypresssequence.

Hypermedia is used as a logical extension of the term hypertext

in which graphics, audio, video, plain text and hyperlinksintertwine to create a generally non-linear medium ofinformation.

Creator: Timm Berners-Lee, 1989.

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DOESTHE WEBAND INTERNETMEANTHESAMETHING?

Internet = collection of networks that connectmillions of businesses, government agencies,educational institutions, and individuals.

WWW = the means we use to access informationover the internet

Different communication protocols

Special link (hyperlink) that enable users to jump fromone place to another on the web.

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NAVIGATINGTHE WEB

Web Browser

Web Address (URL)

Broken down into 4 parts:

Protocol

Top-level Domain (TLD)

Domain Name

Computer on the Domain Name

Web Search Engines


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Computer

WEB ADDRESS SAMPLE


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WEB BROWSER

Is a software application used to enable computers users to

locate and access web pages.

It allows users to locate, view, and navigate the web.

It can have a Graphical User Interface, meaning they can

display pictures (graphics) in addition to text and other forms

of multimedia such as sound and video like Internet Explorer,

Mozilla Firefox, Chrome and Opera, Safari or Mobile Browsers.

First web browser was develop in 1991: Mosaic develop by

Marc Andreessen later became Netscape Navigator.

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EXAMPLEOF WEB BROWSER

Google Chrome

The newest

browser on the

market, distributed

by Google.

Unique features

include thumbnail

access to the most

recently visited

sites from thehome page.

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UNIFORM RESOURCES LOCATOR (URL)

A URL is a webpages unique address.

Compose of several parts that help identify the web document.

1st part indicated the protocol (set of rules) used to retrieve the

specified document. The protocol is generally followed by a colon, two forward slashes,

the domain name (host name), sometimes the path to a specific

Web page or location in a Web page, and the Web page name.

http://www.google.com

URL Basics

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http://www.guidanceillustrations.com/IE6/Basics_I.htmlhttp://www.guidanceillustrations.com/IE6/Basics_I.html


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HYPERTEXT TRANSFER PROTOCOL (HTTP)

HTTP is the protocol (set of rules) that allows files to

be transferred from a computer that hosts the

website (web server) so that we can see the website

on the computer using a browser.


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TOP-LEVEL DOMAIN (TLD) Represents the type of website visiting

Its the suffix after the dot (.com or .edu)


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TOP-LEVEL DOMAINS

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DOMAIN NAME

Represents a company or product name

Makes it easy for users to remember web addresses

It precedes the TLD


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COMPUTER DOMAIN(WWW)

Name of a serverlisteningtomessages using the httpprotocol

It is not always shown in the URL in the Location Box The name can be something other than 'www'


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WEB SEARCH ENGINE

A searching facility designed to search for information on

the World Wide Web.

It helps the user to get information fast and easy.

The search results are usually presented in a list of results

and are commonly called hits.

The information may consist of web pages, images,

information and other types of files. Examples of popular search engine: Google, Yahoo, Bing,

Ecite, lycos, ask.com, live search, etc.

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SEARCH ENGINE

Popular search engines

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EVALUATINGA WEBSITE

1. Who wrote/published the information on the site?

2. What information and resources does the site provide?

1. Content

2. Navigation and Presentation

3. When was the site created/last updated?

4. Where does the site "live"?

5. Why should I use this site?

Evaluating a Website
http://www.classzone.com/books/research_guide/page_build.cfm?state=none&content=web_eval&u=1http://www.classzone.com/books/research_guide/page_build.cfm?state=none&content=web_eval&u=1

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