Just about every network you see now is based on the OSI layer model.
OSI was developed in 1984 by the International Orginisation for Standerdazation (ISO), a global federation of national standards organizations representing approximately 130 countries.
The core of this standard is the OSI Reference Model, a set of seven layers that define the different stages that
data must go through to travel from one device to another over a network
The best way to think about OSI layers is an assembly line. Eacy layer adds somthing to the information being sent across
the network. Each layer adds somthing to prepare it for the next layer.
The 7 layers that seperate into 2 sets are:
- Application : This is the
layer that actually interacts with the Operating System or application when ever the user wants to send Files or information
across the network.
- Presentation : Layer 6 takes the data
provided by the Application layer and converts it into a standard format that the other layers can understand.
- Session : Starts,
maintains and ends communication with the receiving device.
Layer 7 - Application (More Info)
Layer 6 - Presentation (more Info)
Layer 5 - Session
Next page deals with the Second set of the OSI layers.