What does a switch connect in an Ethernet LAN?

A switch in an Ethernet Local Area Network (LAN) serves the primary purpose of connecting multiple devices within that network, allowing them to communicate with each other. While it may seem logical to consider connections primarily involving computers through the mention of four or eight computers, it's important to recognize that a switch can connect more than just a limited number of computers; it is designed to handle multiple ports, potentially allowing dozens or even hundreds of devices to be connected in a more extensive network setup.

The functionality of a switch focuses on facilitating data exchange among networked devices, which includes not only computers but also printers, servers, and other networked devices. Each device connects to a port on the switch, enabling efficient data routing and communication by using MAC addresses to forward data frames specifically to the intended recipient device.

The other options imply connections that are either not the primary function of a switch or misinterpret the role of a switch in a LAN context. For instance, while switches can indeed connect to routers for broader network integration, their core function revolves around local device interconnectivity rather than exclusively connecting computers or external networks. Understanding this fundamental aspect is key to grasping the operational purpose and utility of switches in networking environments.