A computer network is defined as the interconnection of two or more computers. It is done to enable the computers to communicate and share available resources.
THE USE OF COMPUTER NETWORK
wireless: laptops, PDA, mobile, in plane
CLASSIFICATION OF AREA BY
PERSONAL AREA NETWORK(PAN)
A personal area network is a computer network organized around an individual person.
It generally consists of a mobile computer, a cell phone or personal digital assistant. PAN enables the communication among these devices.
It can also be used for communication among personal devices themselves for connecting to a digital level network and internet.
The PANs can be constructed using wireless orcables.
WIDE AREA NETWORK(WAN)
When network spans over a large distance or when the computers to be connected to each other are at widely separated locations a local area network cannot be used. A wide area network(WAN) is installed.
The communication between different users of WAN is established using leased telephone lines, satellite links and similar channels.
It is cheaper and more efficient to use the phone network for the link.
Most WAN networks are used to transfer large blocks of data between its users.
LOCAL AREA NETWORK(LAN)
LAN is a network which is designed to operate over a small physical area such as an office, factory or a group of buildings.
LAN’s are easy to design and troubleshoot
Exchange of information and sharing of resources becomes easy because of LAN.
In LAN all machines are connected to a single cable.
Different types of topologies such as star, tree, bus, ring, etc Can be used
It is usually a privately owned network.
METROPOLITAN AREA NETWORK(MAN)
It is in between LAN & WAN technology that covers the entire city.
It uses similar technology as LAN.
It can be a single network such as cable TV network, or a measure of connecting a number of LAN’s o a large network so thatresources can be shared LAN to LAN as well as device to device.
CAMPUS AREA NETWORK(CAN)
The campus area network is made up of aninterconnection of LAN with limited geographical area.
Network equipments such as switches, routers and the transmission media i.e. optical fibre etc are almost entirely owned by the campus owner.