What is the function of a switch in computer networking?

The function of a switch in computer networking primarily involves connecting devices using packet switching. A switch operates at Layer 2 of the OSI model, known as the Data Link layer, and is responsible for forwarding data packets between devices on the same local area network (LAN). When a device wants to communicate with another device, the switch receives the data packet, and based on the MAC address, it determines which port to send the packet to, thereby directing the traffic efficiently.

Switches improve the performance of a network by reducing collisions and increasing the bandwidth available to devices since they can send and receive data simultaneously. This capability allows multiple devices to communicate with one another without degrading overall network performance, making them essential for modern networking environments where devices need to share resources effectively.

The other options describe functions that do not align with the primary role of switches in networking. For example, converting digital signals to analog signals pertains to modems, establishing wireless connections relates to access points or wireless routers, and providing backup power is the function of uninterruptible power supplies (UPS), rather than switches.