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Introduction to the Internet

Learn the basics of the Internet, including its definition, history, terminology, and different types of internet connections. Discover how websites work, the role of browsers, and how to build a website. Explore internet applications, such as email, chat, e-commerce, and more. Don't miss out on useful websites and how technology has changed our lives.

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Introduction to the Internet

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  1. Introduction to the Internet Present by: Selvakumar(Tech Lead, Senior Software Engineer, at ADT) & Part time Lecturer at Info Tech Sys Email: anselva@yahoo.com Web: www.nselva.com

  2. Interconnected • …by CABLES OR Wireless Definition What is Internet? Global Connection of Computer Networks

  3. Internet

  4. Internet

  5. VoIP

  6. GSM Global System for Mobile communications (GSM)

  7. Internet Services Chat E-Commerce Direct Communication E-Mail Newsgroups Online Conferencing Mailing-List Discussions WWW Distributed Information Resources FTP File Transfer

  8. History About 40 Years Ago Advanced Research Projects Agency

  9. Evolution

  10. Basic concepts Basic concepts: IP (Internet Protocol) – Number to identify computers DNS (Domain Name Server) – maintains a relationship between IP addresses and domain names ICANN (Internet Corporation for Assigned Names and Numbers) Register domain name eg: www.register.com

  11. Terminology ISP (Internet Service Provider) Ex: SLT, Suntel, Dialog, Airtel, …etc

  12. Internet Connection Phone Modem or Router Your PC ISP SLT, Lanka bell, Eureka, etc Internet

  13. Wireless Internet Connection

  14. Connecting • Dial-up Connection–needs MODEM, Phone line and ISP account] • ISDN - (Integrated Services Digital Network) - Digital telephony scheme that allows a user to connect to the Internet over standard phone lines at speeds higher than a 56K modem allows

  15. Connecting • ADSL - (Asymmetric Digital Subscriber Line) is a technology for transmitting digital information at high bandwidths on existing phone lines. • Unlike regular dialup phone service, ADSL provides a continuously-available connection.

  16. Connecting • Cable Internet - Uses a cable modem designed to operate over cable TV lines. • Because the coaxial cable used by cable TV provides much greater bandwidth than telephone lines, a cable modem can be used to achieve extremely fast access to the World Wide Web.

  17. How websites are working? IP: 74.220.215.243 Your Machine Who is look-up? ISP – Internet Service Provider DNS: www.nselva.com

  18. How websites are working?

  19. Browsers • Web Browser

  20. Email

  21. Terminology Web Page VS Web Site Any Ideas???

  22. Terminology • HTTP = Hypertext Transfer Protocol • HTML = Hypertext Mark-up Language

  23. HTML: Sample <html> <head> <title>Example</title> </head> <body> <p><font face="Arial"><br> <font color="#FF0000">Click here to see my pictures:</font></p> <p><a href="http://www.mysite.com/photos.html">My photograhps</a></p> </body> </html>

  24. How can build a web site? • Register Domain Name • Hosting • Website design and development

  25. URL: Sample Universal Resource Locator File Path Internet Protocol www.um.edu.mt/ faculties.html http:// Domain Name

  26. Domains .com .gov .lk .org .net .co.uk .edu Etc…

  27. Hosting After one creates a web-page or site one needs to upload it onto the internet. Example of Free hosting: www.freeservers.com www.fortunecity.com Otherwise one needs to pay for professional hosting services. ISP’s may offer this service.

  28. Internet Applications WWW

  29. XML XML - eXtensible Markup Language XML is not a replacement for HTML. In most web applications, XML is used to transport data, while HTML is used to format and display the data. <note><to>Siva</to><from>Karan</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></note>

  30. Web Designing

  31. Web Development Languages

  32. Credit Card Transaction Process

  33. How technology changed us........

  34. Useful Websites www.nselva.com - My personal website www.sevanthi.com - Download MP3 Songs www.kumbam.com - Matrimonial www.uoctamil.com - Colombo University Tamil Students www.x-rates.com - Exchange Rates www.cse.lk - Colombo Stock Exchange www.mathagal.com - Our Village www.cricinfo.com - Cricket Information http://kerni.jaffnahindu.org - Jaffna Hindu College Old boys

  35. Some websites…

  36. Questions??????

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