NETWORK

What is a Computer Network?

A computer network is a system in which multiple computers are connected to each other to share information and resources.

CHARACTERISTICS OF A COMPUTER NETWORK

Share Resources from one computer to another

Create files and store them in one computer, access those files from the other computer(s) connected over the network

Connect a printer, scanner, or a fax machine to one computer within the network and let other computers of the network use the machines available over network.

Following is the list of hardware's required to setup a computer network.

Network Cables

Distributors

Routers

Internal Network Cards

External Network Cards

TYPE OF COMPUTER NETWORK

There are three type of computer network according area coverage and technology used

LAN: Network in small geographical Area (Room, Building or a Campus) is called LAN (Local Area Network)

Technology used wired

MAN: Network in a City is call MAN (Metropolitan Area Network)

Technology used fiber optic or macro wave

WAN: Network spread geographically (Country or across Globe) is called WAN (Wide Area Network)

Technology used satellite

What is Internet?

It is a Global network of computers, (servers or clients) to exchange information.

It is a "network of networks" that includes millions of  private and public, academic, business, and government networks (local or Global), linked by copper wires, wireless connections, and other technologies 

What is Intranet?

Internal company network that uses Internet standards (HTML, HTTP & TCP/IP protocols) & software

Accessed only by authorized persons, especially members or employees of the organization

What is Extranet?

Extranet is an Intranet for outside authorized users using same internet technology.

Inter-organizational information system

Enable outsiders to work together with company’s employees.

Open to selected suppliers, customers & other business partners