Introduction
The OSI Model
- The Open System Interconnection Model
- Standardization model which we use to demonstrate the theory behind the networking.
- In practical it’s actually the TCP/IP model that the real world is based on. However it is easier to understand with OSI.
- It consists of 7 layers.
Mnemonic: A Penguin Said That Nobody Drinks Pepsi.
Layer 7 - Application
- Provide networking options to programs
- It almost exclusively works with applications, providing an interface for them to transmit the data.
Layer 6 - Presentation
- Receives data from the application layer.
- Presentation layer translates the data into a standardization format, as well as handling any encryption, compression or other transformations to the data.
Layer 5 - Session
- Looks to see if it can setup a connection with other computers across the network.