How does a switch differ from a router?

A switch functions primarily within a local area network (LAN) and is designed to connect multiple devices, such as computers and printers, allowing them to communicate with each other on the same network. It operates at the data link layer of the OSI model, using MAC addresses to forward data to the appropriate devices. This efficient forwarding of frames within the same network allows for high-speed communication among connected devices.

In contrast, a router is used to connect multiple networks together, enabling data to be sent between them. It operates at the network layer of the OSI model and uses IP addresses to determine the best path for data to travel across different networks, such as connecting a home or office network to the Internet. Routers also manage traffic, apply security protocols, and can support various networking protocols.

The correct answer emphasizes the distinct roles of switches and routers: switches serve to interconnect devices within the same local network, while routers facilitate communication between different networks, highlighting their core functionalities in networking.