A computer network or data network is a  telecommunications   network  which allows nodes to share resources. In  computer networks, networked computing devices exchange data with each other using a data link.  The connections  between nodes are  established using either cable media or wireless media. The best-known computer network is the Internet.


Network computer devices that originate, route and  terminate the  data are called   network  nodes.[1] Nodes can include hosts such   as personal computers, phones, servers as well as networking hardware. Two such devices can be said to be   networked together when one  device is able to exchange information with the other device, whether or not they have a direct connection to each other.


Computer networks differ in the transmission medium used to carry their signals, communications protocols to organize network traffic, the network's size, topology and organizational intent.


Computer networks support an enormous number   of applications  and   services such as access to the World Wide Web, digital video, digital audio, shared use of application and storage servers, printers, and fax machines, and use of email and instant   messaging applications  as  well  as  many others. In most cases, application-specific communications protocols are layered (i.e. carried as payload) over other more general communications protocols.

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