Definition
OSI Model
The OSI (Open Systems Interconnection) model is a conceptual model for the functioning of a telecommunications network.
Layers
Physical Layer (Layer 1)
Definition
Link to originalPhysical Layer (Layer 1)
Data Link Layer (Layer 2)
Definition
Link to originalData Link Layer (Layer 2)
Network Layer (Layer 3)
Definition
Link to originalNetwork Layer (Layer 3)
Transport Layer (Layer 4)
Definition
Link to originalTransport Layer (Layer 4)
Session Layer (Layer 5)
Definition
Link to originalSession Layer (Layer 5)
Presentation Layer (Layer 6)
Definition
Link to originalPresentation Layer (Layer 6)
Application Layer (Layer 7)
Definition
Link to originalApplication Layer (Layer 7)
The application layer of the OSI model is the topmost layer, acting as he interface between users and applications and the network.