How does a hub treat a frame destined for a known MAC compared to a switch?

A hub is a Layer 1 device that operates by simply repeating electrical signals. When a hub receives a frame, it broadcasts that frame out of all its other ports, regardless of the destination MAC address. This creates a single collision domain for all connected devices. A switch, on the other hand, is a Layer 2 device that learns MAC addresses and stores them in a MAC address table (also known as a CAM table). When a switch receives a frame, it examines the destination MAC address. If the MAC address is in its table, the switch forwards the frame only out of the specific port connected to that destination, creating separate collision domains for each port. If the destination MAC is unknown, the switch floods the frame out of all ports (except the ingress port), similar to a hub, until it learns the destination's location. The second option is incorrect because hubs do not use a FIB table (Forwarding Information Base), which is used by routers for IP forwarding. The third option is incorrect because hubs do not use MAC tables, and switches use MAC tables for Layer 2 forwarding, not routing tables (which are for Layer 3 IP forwarding). The fourth option is incorrect because it reverses the behavior of hubs and switches.