A computer network allows connected devices to exchange and share data through connections. There are different types of computer networks including WAN, MAN, and LAN. Components of a computer network include network cards, cables like coaxial, fiber optic and twisted pair, and connectivity devices like hubs, switches and routers. Network topology refers to the layout and arrangements of devices in a network, with common topologies being bus, star and ring. Protocols define rules for transferring messages between systems, with examples being TCP/IP, IPX/SPX, and AppleTalk. Computer networks are essential for data sharing and everyday life.
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