What is the primary function of a network switch?

The primary function of a network switch is to receive, process, and forward data to the correct destination. This device operates at the data link layer (Layer 2) of the OSI model, using MAC addresses to determine the appropriate port for forwarding incoming traffic. When a switch receives a data frame, it reads the destination MAC address and efficiently sends the frame only to the port associated with that MAC address, instead of broadcasting it to all ports. This targeted approach reduces network congestion and improves performance as compared to devices that send data to all connected devices.

The ability to manage data traffic intelligently is what distinguishes a switch from other devices in a network hierarchy. Wireless access points serve to connect wireless devices but do not handle wired data traffic in the same manner. While encryption may be necessary for secure transmission, it's not a primary function of a switch. Similarly, while a switch facilitates the local area network (LAN) connectivity of multiple devices, it does not itself provide internet access, which is typically handled by routers. Hence, the answer that highlights the switch's essential operation in managing and directing data is the most accurate.