What is the OSI (Open Systems Interconnection) model
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What is the OSI (Open Systems Interconnection) model
The Open Systems Interconnection (OSI) model is a conceptual framework that was developed by the International Organization for Standardization (ISO) in the late 1970s. It provides a standardized way to describe and understand how different components of a computer network interact with each other. The model is divided into seven layers, each of which performs a specific set of functions.
Starting from the bottom, the first layer is the Physical layer. This layer is concerned with the physical transmission of data over a network. It deals with electrical, mechanical, and physical aspects of the network, such as the cables, connectors, and signal voltages used to transmit data.
The second layer is the Data Link layer. This layer provides error-free transmission of data frames between two devices on the same network. It deals with framing, error detection, and error correction mechanisms to ensure that data is transmitted accurately.
The third layer is the Network layer. This layer is responsible for routing data between networks. It deals with addressing and routing functions to ensure that data is transmitted to its intended destination across multiple networks.
The fourth layer is the Transport layer. This layer provides reliable end-to-end delivery of data between applications. It deals with flow control, error recovery, and segmentation of data into smaller packets to ensure that data is transmitted reliably and efficiently.
The fifth layer is the Session layer. This layer manages the establishment, maintenance, and termination of sessions between applications. It deals with synchronization, checkpointing, and recovery mechanisms to ensure that data is transmitted correctly across different sessions.
The sixth layer is the Presentation layer. This layer provides a standard way to represent data to the application layer. It deals with data compression, encryption, and decryption mechanisms to ensure that data is transmitted in a format that can be understood by the receiving application.
The seventh and final layer is the Application layer. This layer provides a standard interface for applications to access network services. It deals with protocols and services that are used by applications to communicate with other applications across a network.
Overall, the OSI model provides a framework for understanding how different components of a network interact with each other. By breaking down network communication into seven layers, it makes it easier to design, implement, and troubleshoot computer networks.
What is the OSI (Open Systems Interconnection) model
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