Reference Models (PTO for fig.)
Reference Models/OSI ref. model
- ISO OSI (Open Systems Interconnection) Reference Model has 7 layers.
- Principles
- Different levels of abstraction in each layer
- Each layer performs a well defined function (hopefully leading to standards)
- Layer boundaries should minimize information flow between them
- # of layers to be large enough so that different functions are in different
- layer but small enough to make model useful.