About Computer Network
Source:-Wikipedia
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 (data links.) These
data links are established over cable media such as wires or optic
cables, or wireless media such as WiFi.
Network
computer devices that originate, route and terminate the data are called
network nodes. 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. In most cases, application-specific communications
protocols are layered (i.e. carried as payload) over other more
general communications protocols. This formidable collection of information
technology requires skilled network management to keep it
all running reliably.
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. 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. The
best-known computer network is the Internet.
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