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An overall network architecture suitable for implementation with either datagram or virtual circuits facilities

Computer networks were mainly developed for use by universities and research institutes, as is apparent in the case of the ARPA network. In recent years, however, general demand by other users for computer network capabilities has been rapidly expanding. One reason for this growing demand is that diffused data communication systems call for more highly sophisticated techniques. Another reason is the tendency toward decentralized processing to solve various problems experienced in large-scale centralized systems.