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
The data link layer enables communication within a local network.
Network Layer (Layer 3)
Definition
Link to originalNetwork Layer
The network layer enables communication across independent networks.
Transport Layer (Layer 4)
Definition
Link to originalTransport Layer
The transport layer provides end-to-end communication services for applications.
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.