Computer network
A computer
network, often simply referred to as a network, is a collection of hardware
components and computers interconnected by communication channels that allow
sharing of resources and information. Where at least one process in one device
is able to send/receive data to/from at least one process residing in a remote
device, then the two devices are said to be in a network.
Networks
may be classified according to a wide variety of characteristics such as the
medium used to transport the data, communications protocol used, scale, topology,
and organizational scope.
Communications protocols define the rules and
data formats for exchanging information in a computer network, and provide the
basis for network programming. Well-known
communications protocols are Ethernet, a hardware and Link Layer
standard that is ubiquitous in local area networks, and the Internet Protocol Suite, which defines a set of
protocols for internetworking, i.e. for data communication between multiple
networks, as well as host-to-host data transfer, and application-specific data
transmission formats.
Computer
networking is sometimes considered a sub-discipline of electrical engineering, telecommunications, computer science,
information technology or computer engineering, since it relies upon the
theoretical and practical application of these disciplines.
Internet
map. The Internet is a global system of interconnected computer networks that
use the standard Internet Protocol Suite (TCP/IP) to
serve billions of users worldwide.
http://en.wikipedia.org/wiki/Computer_network
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