What is the main function of a LAN switch?

The primary function of a LAN switch is to connect multiple devices within the same network. A switch operates at the data link layer of the OSI model and is responsible for forwarding data frames between devices based on their MAC addresses. This allows devices within the same local area network (LAN) to communicate efficiently by creating a data path for the transmission of information.

In a typical scenario, when one device sends a packet to another device on the same network, the switch receives the packet, reads the MAC address of the destination device, and forwards the packet directly to that specific device. This process reduces unnecessary traffic on the network, as the switch segregates communication between devices without broadcasting the data to all ports.

The other functions mentioned in different options pertain to different devices or network roles. For instance, routing IP packets between different networks is a function of a router rather than a switch. Filtering Internet traffic for security is typically handled by firewalls or security appliances. Providing wireless connectivity is the primary role of wireless access points or routers equipped with wireless capabilities. Each of these functions supports network operations, but the core functionality of a LAN switch is focused on connecting devices within the same LAN.