How are dynamically learned MAC addresses populated in a switch CAM table?
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Correct answer: The CAM table is empty until ingress traffic arrives at each port.
Why this is the answer
A switch's Content Addressable Memory (CAM) table, also known as the MAC address table, is initially empty. It populates dynamically as the switch receives frames. When a frame arrives on a port, the switch inspects the source MAC address and records it, along with the ingress port, in the CAM table. This process allows the switch to build a map of MAC addresses to physical ports, enabling efficient frame forwarding. The other options are incorrect: switches don't learn MAC addresses of other CAM tables, there isn't a universal limit of 10 dynamically learned addresses per port (though port security can configure limits), and dynamic learning doesn't require a minimum number of secure MAC addresses.
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