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High Quality Content by WIKIPEDIA articles! The ARPANET Network Control Program (NCP) provided the middle layers of the protocol stack running on an ARPANET host computer. (Sometimes the abbreviation NCP is mistakenly expanded to Network Control Protocol, but this term is not found in the contemporary documentation.) NCP provided connections and flow control between processes running on different ARPANET host computers. Application services, like e-mail or file transfer, were built on top of NCP, using it to handle connections to other host computers. On the ARPANET, the physical layer, the…mehr

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High Quality Content by WIKIPEDIA articles! The ARPANET Network Control Program (NCP) provided the middle layers of the protocol stack running on an ARPANET host computer. (Sometimes the abbreviation NCP is mistakenly expanded to Network Control Protocol, but this term is not found in the contemporary documentation.) NCP provided connections and flow control between processes running on different ARPANET host computers. Application services, like e-mail or file transfer, were built on top of NCP, using it to handle connections to other host computers. On the ARPANET, the physical layer, the data link layer, and the network layer protocols used internally to the network were implemented on separate Interface Message Processors, called IMPs. The host usually connected to the IMP using another kind of interface, with different physical, data link and network layer specifications. The IMP's capabilities were specified by the Host/IMP Protocol in BBN Report 1822.