OSI Model

The OSI (Open Systems Interconnection) model is a conceptual framework that defines how communication between computers and other devices should be standardized. It was developed by the International Organization for Standardization (ISO) in the 1980s to promote interoperability between different computer systems.

The OSI model consists of seven layers, each of which has a specific function in the communication process. These layers are:

Physical layer: This layer deals with the physical aspects of communication, such as the transmission of data over wires or wireless signals.

Data link layer: This layer handles the organization of data into frames for transmission across a physical network.

Network layer: This layer provides routing and addressing services to ensure that data is delivered to the correct destination across multiple networks.

Transport layer: This layer manages the transfer of data between devices, including error detection and recovery mechanisms.

Session layer: This layer establishes and maintains connections between devices, allowing them to communicate for an extended period.

Presentation layer: This layer handles data encryption, compression, and other transformations to ensure that data can be understood by the receiving device.

Application layer: This layer provides interfaces for applications to access the network and communicate with other devices.

The OSI model is a useful tool for understanding how different technologies work together to enable communication between devices. While it is not strictly adhered to in practice, it provides a standardized reference model that helps engineers design and troubleshoot network systems.

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