What is the OSI layer and explain the work of each layer.

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Accepted Answer

OSI (Open Systems Interconnection) layer is a conceptual model that describes the communication functions of a telecommunication system.

Layer 1 (Physical Layer) - Transmits raw data bits over a communication channel.
Layer 2 (Data Link Layer) - Provides error-free transfer of data frames between nodes over the physical layer.
Layer 3 (Network Layer) - Provides logical addressing and routing of data packets between nodes on different networks.
Layer 4 (Transport Layer) - Provides reliable data transfer between end systems and manages flow control, error checking, and recovery.
Layer 5 (Session Layer) - Establishes, manages, and terminates sessions between applications.
Layer 6 (Presentation Layer) - Translates, encrypts, and compresses data for transmission.
Layer 7 (Application Layer) - Provides services directly to the end-user applications.

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