MODULE 1.1 Basic Internet Concepts Instructions - This part of the: • course is a PowerPoint demonstration intended to introduce you to Basic Internet Concepts. • module is off-line and is intended as an information resource for reference use.
Topics • Basic Internet Concepts • Structure of the Internet • Common Internet Protocols
What is the Internet? • Publicly accessible network of interconnected computers which communicate via software protocol standards • Easily accessed (via modem and phone line, ISDN, direct cable landline, satellite) • Expanding global infrastructure • Regarding information delivery, the most significant change since the development of the printing press in the 15th century!
Internet Growth • Exponential growth for the last few years • The Web Server market has grown from 120,000 units in 1995 to 45 million in 2003 • In 1993, 90,000 people used the Internet; in 2002, 600 million people used the Internet; in 2007, over 1 billion people will use the Internet • Hardware costs are decreasing year on year • Over the next 10 years electronic commerce will boom, reaching $100s of billions by the year 2010
Internet Architecture Give me file x Computer on the Internet holding information - remote “server” Here it is Desktop computer - “client”
Server/Client Interface SERVERS Hardware + Software Software Protocols CLIENTS Hardware + Software
Internet Services • The World-Wide Web (Multimedia Information Services) • Search tools (via the World-Wide Web) • Communication (E-mail, Telnet) • Retrieval/information transfer (FTP)
The World Wide Web • WWW, web, W3, World Wide Web • Often what people mean by the Internet • Based on hypertext - the ability to link text and documents dynamically and interactively • Uses hypertext markup language - HTML • The WWW is a global standard • Can use text, graphics, sound and video • Anyone can link to and make use of the web
Means of Delivery • Most often cables carry information back and forth between the client and server • 2nd principal option for delivery is satellite • Cables vary in speed and amount of information they can carry • Sometimes cables are slow in carrying information or lose the signal, especially if: • information must cross long distances • too much traffic on the cable • cable capacity, or bandwidth, is low
Web Browser • Browser is the software that is used to view the Web • Standard browser features • scrolling, back, forward, stop, home, refresh • Navigation - in built features • back, forward, home, go to, yes, no • Search on a single web page • Multiple Web browser windows
Browser Customization • Toolbar options • Link to a specific homepage • Using the right click mouse button • Using favorites or bookmarks • Adding • Organizing • Editing
Browser Requirements HINARI works best with: • Microsoft® Internet Explorer version 4.0 or higherStandard versions included with Microsoft® Windows 98/ME/2K/XP are adequate. To download Internet Explorer go to: http://www.microsoft.com/ie/download/ • Netscape version 6 or higher.For a Netscape browser go to: http://www.netscape.com/download/ • Mozilla Firefox version 1.0 or higher For a Mozilla Firefox browser go to: http://www.mozilla.com/en-US/firefox/
Adobe Acrobat PDFs • You will need an Adobe Acrobat Reader to view journal articles in PDF format. • Adobe Acrobat Reader can be downloaded for FREE from the Adobe web site: http://www.adobe.com/prodindex/acrobat/readstep2.html
The Internet Address or URL This page is being viewed in the Internet Explorer Browser. Browsers allow computers to read Hyper Text Mark-up Language OR HTML. The Address or URL is typed in here.
Entering a URL address in the address box After entering a URL address in the address box click Go or hit the RETURN key. In this example we have entered http://www.who.int for the WHO website
Hypertext links Links to other pages are usually underlined or in another colour of text.
Forward and back navigation buttons The arrow buttons on the tool bar allow users to move Back and Forward to pages within the website.
Home page button The House icon on the tool bar will take you back to the browser’s default Home Page.
This is the end of Module 1 This is the end of Module 1.1 There is a Work Book to accompany this part of the module. The workbook will take you through a live session covering the topics included in this demonstration with working examples. Updated 02 2008