In my opinion, the network model that they can use is Systems Network Architecture.
Systems Network Architecture (SNA) can be defined as a data communication architecture established by IBM to specify common conventions for communication among the wide array of IBM hardware and software data communication products and other platforms. Systems Network Architecture is IBM's proprietary networking architecture, built in 1974. It is a complete protocol stack for interconnecting computers and their resources. SNA explains formats and protocols but, in itself, is not a piece of software.
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