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Cisco Certified Network Associate (CCNA) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
The answer is A.
I'm surprised how many people think it is B. A CAM table (aka MAC table) is a table on a switch that associates the MAC address of the device connected on each port. As traffic comes from each port (ingress), the switch will update it's CAM table with the source address of the frame. It's that simple. Switches don't exchange CAMs with other switches, this is why we need things like STP to prevent switching loops. This question seems to test people on two things, how switches populate it's CAM/MAC tables, and do you know what the terms "ingress" and "CAM" mean.
The correct answer is A