A computer network is a group of computer systems and other computing hardware devices that are linked together through communication channels to facilitate communication and resource-sharing among a wide range of users.
Network protocols and standards specify exactly how data should be transmitted and received. Modern, packet switched networks use protocols -- TCP/IP being the most widespread -- to establish a standard means of communication
Networks may also be categorized by the scope of their domains. Local area networks (LANs) interconnect endpoints in a single domain. Wide area networks interconnect multiple LANs, and metropolitan area networks interconnect computer resources in a geographic area. Storage area networks interconnect storage devices and resources. Networks may also be divided into subnetworks, also called subnets.
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