Wednesday, August 6, 2008

The OSI Reference Model - Networking

The OSI Reference Model
The OSI model is also called ISO OSI (Open System Interconnection) reference model. It is because it deals with connecting open systems which is systems that are open for communication with other systems.

The principle of OSI reference Model
1. A layer should be created where different level of abstraction is needed.
2. Each layer should perform their own defined function.
3. The function of each layer should be chosen and defined by internationally standardized protocols.
4. The layer boundaries should be chosen to minimize the information flow across the interfaces.
5. The number of layers should be large enough and the same layer should not have the same function.

The seven layer of OSI model