Which is true about a Layer 2 switch?

A Layer 2 switch learns MAC addresses and forwards frames based on the destination MAC. It supports VLAN segmentation using tagging protocols like 802.1Q, allowing you to logically separate networks on the same physical switch. "Forwards all received frames to every connected device" describes a hub, not a switch, as switches forward frames only to the destination port (or all ports if the destination is unknown or it's a broadcast). "Provides one collision domain for all connected devices" is also true for a hub; a switch creates a separate collision domain for each port. "Operates only at half duplex" is incorrect; modern switches and connected devices typically operate at full duplex, allowing simultaneous sending and receiving.