OSI Model in Networking - Networking Tutorial #5

• International Standard Organization (ISO) established a committee in 1977 to develop an architecture for computer communication 
• Open systems interconnection (OSI) reference model was approved  as an international standard for communication architecture
• term "open" denotes the ability to connect any two systems which conform to the reference model and associated standards   

Physical

covers all - mechanical , electrical , functional and

Procedural - aspect for physical communication

Data Link  

Physical address , networking topology , error notification ,requesting  of frames , etc

Network

Routing , inter-networking , subnet traffic control packet logical - physical address mapping 

Transport 

Message segmentation , connection control , receive - point addressing  , error correction 

Session

Session establishment , session control , maintenance and termination 

Presentation 

Encryption compression , translation or data conversion

Aplication

Interacts with application programs and other layers of OSI model management functions  to support distributed applications