What does a switch do in a LAN?

A switch in a Local Area Network (LAN) plays a crucial role by connecting multiple devices, such as computers, printers, and servers, allowing them to communicate with one another efficiently. It operates at the data link layer (Layer 2) of the OSI model, using MAC addresses to forward data to the correct destination within the network. This management of traffic is vital in preventing data collisions and ensuring that data packets are sent only to the intended devices, thus optimizing network performance.

The function of a switch directly contrasts with providing wireless connections, delivering internet access, or acting as a firewall, which are roles served by other devices like access points, routers, and dedicated security appliances. By focusing on device connectivity and traffic management, a switch is fundamental to creating a functional and organized network.