Which device functions at the data link layer of the OSI model?

The switch operates at the data link layer of the OSI model. This layer is responsible for node-to-node data transfer and error correction. Switches use MAC addresses to identify devices on the same local area network (LAN). When a switch receives a data frame, it checks the MAC address and forwards the frame to the appropriate port, ensuring that data is sent only to the intended recipient. This functionality is crucial for efficient communication within a network, as it reduces unnecessary traffic and enhances overall network performance. In contrast, routers operate at the network layer, hubs function at the physical layer by simply transmitting electrical signals without any data processing, and modems convert digital data to analog signals for transmission over communication lines, involving both the physical and data link layers but primarily functioning at a different level of OSI.