What is a main function of an Ethernet switch?

An Ethernet switch primarily serves the purpose of connecting multiple Ethernet devices within a local area network (LAN). It acts as a central hub that facilitates communication between devices such as computers, printers, and servers, allowing them to share data efficiently. When a device sends data, the switch receives that data packet and determines the destination device's MAC address, ensuring the data is transmitted only to the intended recipient. This targeted communication reduces network congestion and increases overall efficiency.

The other choices do not accurately describe the main function of an Ethernet switch. While switches enable devices to communicate, they do not inherently increase network traffic or provide internet connectivity—that is typically the role of a router. Similarly, converting signals between formats is a function associated with media converters or specific networking hardware, rather than a basic switch itself. Thus, the correct answer highlights the core capability of an Ethernet switch in managing connections within a network.