OSI MODEL

OSI MODEL

The OSI (Open Systems Interconnection) was created by the International Organisation for Standardisation (ISO) as a framework used to describe how data is transferred over a medium from one networked device to another. It is made up of 7 layers:

• 7. Application
• 6. Presentation
• 5. Session
• 4. Transport
• 3. Network
• 2. Data Link
• 1. Physical

The 4 main advantages of the OSI are:

1. It divides the communication process into simpler components, aiding component development, design, and troubleshooting.
2. It encourages industry standardization by defining what functions occur at each layer of the model.
3. It prevents changes in one layer from affecting other layers, so that it does not hamper development.
4. It allows various types of network hardware and software to communicate.