What is the OSI Model?

The OSI model (Open Systems Interconnection model) is a framework that defines how communications should take place between different devices in a computer network. It divides the process of communication into seven layers, each with a specific function:

1. Physical: The physical layer deals with the transmission of data over a physical medium, such as a copper wire or fiber optic cable.
2. Data Link: The data link layer is responsible for establishing a link between devices on the same network and for providing error-free transmission of data.
3. Network: The network layer is responsible for routing data between devices on different networks.
4. Transport: The transport layer ensures that data is delivered reliably and in the correct order to the destination.
5. Session: The session layer establishes, maintains, and terminates communication sessions between devices.
6. Presentation: The presentation layer is responsible for converting data into a form that can be understood by the application layer.
7. Application: The application layer is the highest layer of the OSI model and is responsible for providing services to the user.

The OSI model provides a standard way of thinking about and designing networks, making it easier for different devices and systems to communicate with each other.

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