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Basic type: Wide Area Networks (WANs). LANs connect computers and peripheral devices in a limited physical area, such as a business office, laboratory, or college campus, by means of permanent links that transmit data rapidly. A typical LAN consists of two or more personal computers, printers and high-capacity disk-storage device called “file servers”, which enable each computer on the network to access a common set of files. LAN operating system software, which interprets input and instructs networked devices, allow users to communicate with each other, share the printers and storage equipment, and simultaneously access centrally located processors, data or programs. LAN users may also access other LANs or tap into wide area networks. LANs with similar architectures are linked by “bridges”, which act as transfer points. LANs with different architectures are linked by “gateways”, which convert data as it passes between systems. The devices on a LAN are known as “nodes”, and the nodes are connected by cabling through which messages are transmitted. Types of cables include twisted-pair wiring, coaxial cable or fibre-optic cable. Nodes on a LAN can be wired together in any of three basic topologies, known as bus, ring and star. As implied by their names, a bus network is more or less linear, a ring network forms a loop, and a star network radiates form a central hub. All LANs have at least three basic components: Workstations (PCs or terminals); File server or disk server (a special PC or larger computer where shared software resources and files are stored); Connection hardware that includes cabling and interface cards. Yc‘ЅЇЩп№d r Ш а H I P о п дејэхјнхнхнхнхехЭхехеТhwЙh hŠmH sH hИVMmH sH h hŠmH sH hдKШmH sH hwЙmH sH hwЙhwЙmH sH h"mH sH ‘œрфe f r I п в#–е§є§§ыыыццц§§§§ооо & Fgd hŠgdдKШ„Ф^„ФgdдKШ„Ф^„Фgd"е§,1hА‚. 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