OSI - Layered Model Concept
Open Systems Interconnection Reference Model (OSI-RM) adopted as a standard for networking
Divide-and-conquer approach
Dividing requirements into groups, e.g transporting of data, packaging of messages, end user applications
Each group can be referred to as a layer
- Upper layers are logically closer to the user and deal with more abstract data, relying on lower layer protocols to translate data into forms that can eventually be physically transmitted.