A computer network or data network is a telecommunications
network that allows computers to exchange data. In computer networks, networked
computing devices pass data to each other along data connections. Data is
transferred in the form of packets. The connections (network links) 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 are
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 physical media used to
transmit their signals, the communications protocols to organize network
traffic, the network's size, topology and organizational intent. In most cases,
communications protocols are layered on (i.e. work using) other more specific
or more general communications protocols, except for the physical layer that
directly deals with the physical media.
Computer networks support applications such as access to the
World Wide Web, shared use of application and storage servers, printers, and
fax machines, and use of email and instant messaging applications..
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