B. "Each connecting CAM table" is incorrect wording — the CAM table is internal to the switch and not something switches connect to each other.
However, if we interpret it as "each connecting device" (likely the intended meaning), then the idea becomes valid:
Switches dynamically learn the MAC addresses of connected devices by analyzing incoming frames.
A.
Factually correct: Yes, the CAM table is empty at first and is populated only when traffic enters the port.
However: This describes a detail of how the feature works, not a complete answer to the question "how does the feature function." It's an effect, not a definition of the feature. The correct answer is: B.
The dynamically-learned MAC address feature allows the switch to learn the MAC addresses of devices connected to its ports as traffic flows through the network.
While Option A[The CAM table is empty until ingress traffic arrives at each port ] statement is correct, However it does not answer the question which has been asked, So Answer B [Switches dynamically learn MAC addresses of each connecting CAM table] is correct which explains how switch learn mac address dynamically
While it's true that the CAM table starts empty when the switch is powered on or reset, it dynamically populates as traffic is received on the switch ports. As frames arrive with source MAC addresses, the switch learns and records these MAC addresses along with the corresponding ingress ports in the CAM table.
Dynamic MAC Address Learning
Dynamic MAC address learning occurs when the bridging data path encounters an ingress frame whose source address is not present in the MAC address table for the ingress service instance. The learned MAC addresses are distributed to the other cards with Ethernet Flow Points (EFPs) in the same bridge domain.
Option A is incorrect because the CAM table is not empty until ingress traffic arrives at each port. The CAM table is constantly updated as new MAC addresses are learned and old MAC addresses are aged out.
Content Addressable Memory (CAM) table is a system memory construct used by Ethernet switch logic which stores information such as MAC addresses available on physical ports
A is correct. https://www.cisco.com/c/en/us/td/docs/switches/metro/me2600x/config/guide/b_ME2600X-scg/b_ME2600X-scg_chapter_0110.pdf
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