A computer network , also called a computer network or computer network , is a set of equipment ( computers and / or devices) connected by cables, signals, waves or any other method of data transport, which share information ( files ) , resources ( CD-ROM , printers ), services ( internet access , E-mail , chat , games ) jobs that require network+ certification.
A communications network is a set of technical means that allow remote communication between autonomous equipment (non-hierarchical -master / slave-). Normally it is about transmitting data, audio and video by electromagnetic waves through various transmission media (air, vacuum, copper cable, fiber optic cable ).
To simplify communication between programs (applications) on different computers, the OSI model was defined by the ISO , which specifies 7 different layers of abstraction. With this, each layer develops a specific function with a defined scope.
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