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The role of NCP/VS in an SNA environment has been examined from a vantage point within the network looking outward toward the host application programs and the terminal facilities. Data link control, path control, and connection point management work together to oversee the network traffic while maintaining separation of the SNA functional layers. The NCP physical unit services component cooperates with the system services control point in the host to govern operation of the physical resources associated with the NCP, as well as to oversee sophisticated testing and statistics recording. Thus, network functions are distributed amongst the host computer and the communications controllers throughout the network.
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