A computer network, or data network, is a digital telecommunications network which allows nodes to share resources. In computer networks, computing devices exchange data with each other using connections between nodes.
LAN (local area network)
A local area network is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building.
MAN (metropolitan area network)
A metropolitan area network is a computer network that interconnects users with computer resources in a geographic area or region larger than that covered by even a large local area network but smaller than the area covered by a wide area network.
WAN (wide area network)
A wide area network is a telecommunications network or computer network that extends over a large geographical distance/place. Wide area networks are often established with leased telecommunication circuits.
PAN (personal are network)
A personal area network is a computer network for interconnecting devices centered on an individual person's workspace. A PAN provides data transmission amongst devices such as computers, smartphones, tablets and personal digital assistants.
https://en.wikipedia.org/wiki/Computer_network
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