COMPUTER NETWORK

Each time we use the phone,weuse use the world largest telecommnication network or the telephone system.A telephone is an endpoint or a node,connected to a computer to a network of telephone that routs your voice signals to anyone of the 500 million telephone in the world.Computer network can be defined as The combination of two or more computer in such a way that they can share the resources of each other.Computer networks may be classified according to the scale: Personal area network (PAN), Local Area Network(LAN), Campus AreaNetwork (CAN), Metropolitan area network (MAN), or Wide area network(WAN).
As Ethernet increasingly is the standard interface for networks, these distinctions are more important to the network administrator than the user. Network administrators may have to tune the network, to correct delay issuComputer networks can also be classified according to the hardware technology that is used to connect the individual devices in the network such as Optical fibre, Ethernet, Wireless LAN, HomePNA, or Power line communication.
Ethernets use physical wiring to connect devices. Often they employ hubs, switches, bridges, and/or routers.
Wireless LAN technology is built to connect devices without wiring. These devices use a radio frequency to connectes and achieve the desired performance level.