Which component holds the list of MAC addresses learned by the switch for each port?

• A. Transmission Control
• B. Switch
• C. CAM Table
• D. Sticky MAC

Answer: (C)

When a switch sees a frame, it learns the source MAC address and records it together with the port it arrived on. This information is stored in a MAC address table inside the switch, commonly called the CAM table. CAM stands for Content Addressable Memory, and it lets the switch map each MAC address to the specific port where the device is reachable. This enables efficient forwarding: when a frame with a known destination MAC is received, the switch uses the CAM table to send it only to the correct port. Entries are dynamic and can time out if not seen again, keeping the table current. There’s also the concept of sticky MAC, where certain addresses can be made static via port security, but that’s about persistence, not the basic storage location itself. The other terms don’t describe the actual storage of learned MAC addresses—the CAM table is the component that holds this per-port mapping.