Which device is used to connect multiple devices on a local area network?

A switch is specifically designed to connect multiple devices within a local area network (LAN). It operates at the data link layer of the OSI model, facilitating communication between devices by using MAC addresses to forward data only to the intended recipient rather than broadcasting it to all ports. This targeted data delivery improves network efficiency and reduces unnecessary traffic.

In contrast, a router connects different networks, such as a LAN to the internet, by directing data packets between them based on IP addresses. A modem serves as a bridge between your local network and your Internet Service Provider (ISP) to access the internet, and a repeater simply amplifies signals to extend the range of a network. Thus, while all these devices play important roles in networking, the switch is the primary device for interconnecting multiple devices within a LAN.