Introduction to Network

A network is a collection of computers and devices connected to each other. The network allows computers to communicate with each other and share resources and information.Or A network is a group of computers, printers, and other devices that are connected together with cables. Information travels over the cables, allowing network users to exchange documents & data with each other, print to the same printers, and generally share any hardware or software that is connected to the network. Each computer, printer, or other peripheral device that is connected to the network is called a node.
For making one Network minimum size of Computers should be 2, while maximumThere could be Millions of Computer. In one netwo6rk there could be different ComputerAnd different NOS (Network Operating System).
The Advance Research Projects Agency (ARPA) designed "Advanced Research Projects Agency Network" (ARPANET) for the United States Department of Defense. It was the first computer network in the world in late 1960's and early 1970's.

Benefits of Making Networks

§ Fast Communication
§ Sharing data
§ Sharing Resources (Printer, Scanner, Optical Drives, Magnetical Drives etc)
§ Cost effective (by using one device by many computers)
§ Security (Domain)
§ Centralize Administration
§ Electronic Mail
§ Electronic Commerce
§ And many more.

Resources for making a Network

§ Computers
§ LAN Cards/NIC/Ethernet Card
§ Media (Cable, Waves)
§ Connectors (BNC, AUI, RJ45, Fiber Clips)
§ HUB/Switch (Star Topology)
§ Router (in case of WAN)
§ NOS (Network Operating System)

Types of Network According Area

1: LAN (Local Area Network)
2: MAN (Metropolitan Area Network)
3: WAN (Wide Area Network)

LAN
A Local Area Network is the Network of different Computers in well defines and Small Area like a Network of any organization in one building or cluster of buildings But should be with in 1KM.

MAN
A Metropolitan Area Network is the Network of different remote access buildings
In one city. A city can be large and small. OR the Network of different LANs in one City is called MAN.



WAN
A wide Area Network is Network of different LANs which exist in different cities or Different countries.