Which concept involves dynamically learning and then persisting the first MAC address seen on a switch port to authorize future devices?

Which concept involves dynamically learning and then persisting the first MAC address seen on a switch port to authorize future devices?

• A. CAM Table
• B. Persistent MAC Learning
• C. Switch
• D. MAC Flood

Answer: (B)

This is sticky (persistent) MAC learning within port security. The idea is that a switch port dynamically learns the MAC address of the first device that connects, and then stores that address so the port will continue to recognize and authorize that same device in the future. By saving the learned MAC to the startup configuration, the authorization persists across reboots, ensuring only the previously seen device can use that port unless you update the list.

In this context, the CAM table idea is related because it holds MAC-to-port mappings, but sticky/persistent MAC learning specifically covers the aspect of saving the first learned MAC so it remains authorized over time. The other options don’t fit: a switch is just the device itself, and a MAC flood is a type of attack that aims to exhaust CAM table capacity rather than authorize devices.