What is the function of an Ethernet switch?

An Ethernet switch functions primarily to connect multiple devices within a Local Area Network (LAN). It operates at the data link layer (Layer 2) of the OSI model, allowing devices such as computers, printers, and servers to communicate with one another efficiently.

The switch uses MAC addresses to forward packets only to the intended recipient devices, which enhances the speed and efficiency of the network by reducing unnecessary traffic. By creating a network of interconnected devices, the switch enables seamless communication and resource sharing among them. This core function is crucial for local networks where managing device interactions is necessary for effective operation.

Considering the other options, filtering internet traffic pertains more to routers or specialized security devices, while firewalls are designed to protect networks from unauthorized access rather than facilitate device communication. Additionally, providing wireless connectivity is the function of wireless access points or routers, rather than Ethernet switches, which are typically limited to wired connections.