1. Professional Web Designing For Absolute Beginners
Chapter 01 - Principles of Internet
Introduction to Internet
Professional Web Designing For Absolute Beginners
Kandy Regional Centre | Pasan Mallawaarachchi

2. Understanding the Internet and Web Sites
Pasan Mallawaarachchi

3. What is INTERNET
Is a Global Network
It is the largest network in the world that connects hundreds of thousands of individual computers all over the world
Pasan Mallawaarachchi

4. A Network is a,
A network is a group of two or more computes connected together.
There are many types of computer networks, including:
local-area networks (LANs)
The computers are geographically close together (that is, in the same building).
wide-area networks (WANs)
The computers are farther apart and are connected by telephone lines or radio waves.
metropolitan-area networks MANs)
A data network designed for a town or city.
home-area networks (HANs)
A network contained within a user's home that connects a person's digital devices.

6. WAN

8. Why Computer networks Allows computers to exchange data
The connections between devices established using wireless media or cable media
Wireless – Radio (WIFI), Microwave, Satellite
Cable – telephone, fiber optics, twisted pair, coaxial cable etc

10. Why Computer networks
Computer networks support applications access to the,
World Wide Web
Servers, printers etc
fax machines
use of and instant messaging applications
The best-known computer network is the Internet.

11. Definition of Internet
A global network of computer networks that use Standard protocols to Connect & Exchange information, the Largest Network of computer networks.
The computers are connected via telephone, Fiber Optic cables, Radio, Microwave or Satellites.
Protocols – FTP, HTTP, SMTP

13. How to connect to internet

14. INTERNET con. An Information System Communication Tool No one owns it
The popular term for the Internet is the “information highway”

15. Terms
Protocols:
Just like how we cannot communicate without both knowing the same language,
computers cannot communicate without some accepted protocol
A protocol is a set of rules to establish connection in computer network
TCP/IP
HTTP
FTP

16. TCP / IP Transmission Control Protocol / Internet Protocol
TCP/IP provides
end-to-end connectivity
specifying how data should be formatted,
addressed,
transmitted,
routed and received at the destination.

17. tcp/ip
TCP - is used for transmission of data from an application to the network.
IP - takes care of the communication with other computers.

18. TCP / IP
Web browsers use TCP when they connect to servers on the World Wide Web
TCP/IP is the communication protocol for the internet.
TCP/IP defines the rule computers must follow to communicate with each other over the internet.

19. Connection Eshtablishment

21. HTTP Hyper Text Transfer Protocol
HTTP is the foundation of data communication for the World Wide Web.
HTTP is the protocol to exchange or transfer hypertext.
HTTP functions as a request-response protocol in the client-server computing model

22. http request

23. http
HTTP takes care of the communication between a web server and a web browser.
HTTP is used for sending requests from a web client (a browser) to a web server, returning web content (web pages) from the server back to the client. Ex

24. FTP File Transfer Protocol
Standard network protocol used to transfer files from one host or to another host over network Ex
ftp://public.ftp-servers.example.com/mydirectory/myfile.txt

25. Thank You