What is the main function of a switch in a network?

The primary function of a switch in a network 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 receiving incoming data packets and redirecting them to the correct destination device on the local area network (LAN). This is achieved by using MAC addresses to identify devices, ensuring efficient and direct communication between the devices connected to the switch.

By connecting various devices such as computers, printers, and servers, a switch facilitates local communication and data sharing. This capability significantly enhances the performance of a network by reducing collisions and optimizing the flow of data, as each device can communicate without interference from others when connected to a switch. In contrast, other functions such as routing data between different networks, amplifying signals, or providing internet access involve devices like routers, repeaters, or modems, which serve different networking purposes.