The NCP interface allowed application software to connect across the ARPANET by implementing higher-level communication protocols , an early example of the protocol layering concept later incorporated in the OSI model . [ 58 ] NCP was developed under the leadership of Steve Crocker , then a graduate student at UCLA.

Below we can see DECnet on the wire. tshark -i br0 'decnet' Capturing on 'br0' [ 551.435843] device br0 entered promiscuous mode 1 0.000000000 1.1 � DECNET-Phase-IV-end-node-Hello-packets DEC DNA 50 Routing control, Endnode Hello message 2 10.240010635 1.1 � DECNET-Phase-IV-end-node-Hello-packets DEC DNA 50 Routing control, Endnode Hello message 3 20.479982267 1.1 � DECNET-Phase-IV-end-node-Hello-packets DEC DNA 50 Routing control, Endnode Hello message 4...

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