In a computer network, special standards called protocols are used to ensure compatibility of the levels of network architecture. They are hardware and software. Hardware devices (interfaces) support standards at the physical level, and at the data level they work using special software support tools.
Local and global networks are determined by what protocols they use. In a local area network, computers use mainly a single set of standards for all network participants, and combine computers in a room, building, or floor.
Global networks cover, as a rule, large areas. They combine both individual computers and local networks using various protocols.
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