Computer networks can usually be attributed to one of three groups, depending on their size and functions. Local area network (LAN, Local Area Network, LAN) is the main class of computer networks. LAN architecture can vary between simple (two computers connected by a cable) and complex (hundreds of computers and peripheral devices, networked in a larger organization). The distinctive feature of BOS is that it exists within a limited geographical area, such as a building or a Department of the company (as a rule, does not exceed 5 km in diameter). If the computers in the network, are located in several buildings on a large urban area, the network is sometimes referred to as regional or city network (Metropolitan Area Network, MAN, usually located in diameter 5-50 km). In contrast to these classes, the global network of networks (Wide Area Network, WAN) has no geographic boundaries and can connect between computers and peripheral devices that are on different sides of the world. In most cases, the global network consists of several interconnected LANs. Perhaps the Internet can be regarded as the ultimate global network.
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