OSI Model

OSI Model

OSI stands for Open System Interconnection. An open system is a model that allows any two systems to communicate even if their architectures are different. OSI model was developed by International Standards Organization (ISO) in 1983. It provides logical framework for data communication processes to interact across networks. The standards were created for computer industry to allow different networks.

This model consists of seven layers. Each layer performs a specific functions in a network communication. The layer are divided into two groups:

Upper Layer: The upper layers focus on user applications and how files are represented on computers before transfer.

Lower Layer: The lower layers are concerned with how the communication across a network actually occurs.

Different Layers of OSI Model:

7. Application Layer

6. Presentation Layer

5. Session Layer

4. Transport Layer

3. Network Layer

2. Data Link Layer

1. Physical Layer