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Systems Network Architecture
A
large, complex, feature-rich network architecture developed in the 1970s by
IBM. Similar in some respects to the Open System Interconnection (OSI)
reference model, but with a number of differences. SNA is essentially composed
of seven layers. See data flow control layer, data link control layer, path
control layer, physical control layer, presentation services layer, transaction
services layer, and transmission control layer.
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