Transmitting messages from a sending computer process to a receiving computer process occurs at which layer of the OSI model?

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Transmitting messages from a sending computer process to a receiving computer process occurs at the Transport Layer of the OSI model. This layer is responsible for providing end-to-end communication services for applications. It ensures that data is delivered error-free and in the same order it was sent, thus facilitating reliable or connection-oriented communication using protocols such as TCP (Transmission Control Protocol).

The Transport Layer is integral in segmenting the data into manageable packets and then reassembling them at the destination. Additionally, it handles flow control and congestion control, which are essential for maintaining effective communication between processes on the sending and receiving machines.

While the Application Layer is involved with the user interface and application-level protocols, it does not directly manage the transmission of messages between processes. The Network Layer is primarily focused on determining the best path for data packet transfer across networks, without addressing the end-to-end communication requirements of applications. The Session Layer is responsible for establishing, managing, and terminating connections but does not itself manage the transmission of messages between processes.

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