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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:
Classic OSI 7-layer model
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.
 
Lecture 25: The OSIRM in Brief, also Revision and Exam Preview Copyright © 2005 P.Scott, La Trobe University Bendigo.

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