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The Classic OSI Reference Model Diagram
The Open Systems Interconnection Reference Model (OSIRM) specifies
a 7 layer architecture for Computer Networking.
Diagramatically:
The conceptual intention here is that each the software which
implements each layer communicates with its Peer
Layer software, using services provided by the lower
layers.
The software and protocols which implement a layer are called
entities in OSIRM.
The diagram is sometimes called (rather disrespectfully) the
7-layer-cake model.
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