Which of the following best describes a network switch?

A network switch is primarily designed to connect multiple devices on a single local area network (LAN), enabling them to communicate with each other efficiently. It operates at the data link layer (Layer 2) of the OSI model, where it uses MAC addresses to forward data only to the intended device rather than broadcasting it to all devices on the network. This selective forwarding helps reduce network congestion and improves performance. By managing the communication between devices like computers, printers, and servers within the same network, a switch plays a crucial role in ensuring efficient data exchange.

The other options do not accurately describe the primary function of a switch. For example, a device that connects networks and routes traffic typically refers to a router, which operates on a different layer and has broader networking functionality, including managing traffic between different networks. The mention of filtering and forwarding packets between networks aligns more with the role of a router or a firewall rather than a switch. Finally, a device primarily used for wireless connectivity would be an access point or a wireless router, distinct from the wired connectivity function of a switch.