Which of the following is not a function of the Transport layer?

The Transport layer is responsible for providing end-to-end communication services for applications. Its primary functions include error correction, flow control, and segmentation of data.

Error correction involves ensuring that data is transmitted accurately between sender and receiver, often through the use of checksums and acknowledgments. Flow control is crucial for managing the rate of data transmission between devices to prevent a fast sender from overwhelming a slow receiver. Segmentation involves breaking down large messages into smaller segments that can be transmitted more easily across the network, allowing for efficient data handling.

In contrast, physical addressing, which relates to identifying devices on a physical network, is a function of the Data Link layer. This layer manages how data is formatted for transmission over the physical medium, regulates access to that medium, and handles the addressing of devices on a local network. Therefore, the aspect of physical addressing is not a function of the Transport layer, making it the correct choice in this context.