CAM? Is it a typo?

It's another name for the MAC address table

So what?? It doesn’t need to receive trafic on EACH port of a switch to start to fill it. just on one port is enough !

Selected Answer: A correct answer

Selected Answer: A https://www.cisco.com/c/en/us/td/docs/optical/cpt/r_975/cpt975_configuration/cpt972_configuration_chapter_01110.html

Selected Answer: B While it's true that the CAM table starts empty when the switch is powered on or reset, it dynamically fills as traffic is received on the switch ports. As frames arrive with source MAC addresses, the switch learns and records these MAC addresses together with the matching ingress ports in the CAM table.

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

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

The CAM table is empty until ingress traffic arrives at EACH port? Is the CAM empty until then??

Yes! The mac addresse table is empty when the switch start

nope Content Addressable Memory

Switches also learn MAC addresses from ARP so, thus MAC learn is also possible.

Option B is correct because switches dynamically learn the MAC addresses of each connecting device and store them in the CAM table.

Err, and how many "connecting CAM tables" do you think a switch has?

Option A is wrong because the CAM table is not empty until ingress traffic arrives at each port. The CAM table is continuously updated as new MAC addresses are learned and old MAC addresses are aged out.

So Option B is Correct and most Common sense one.

The question is strictly talking about dynamically learned MAC-addresses

Dynamic MAC Address Learning Dynamic MAC address learning happens when the bridging data path sees an ingress frame whose source address is not found in the MAC address table for the ingress service instance. The learned MAC addresses are sent to the other cards with Ethernet Flow Points (EFPs) in the same bridge domain.

Selected Answer: B 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

Selected Answer: A I think A is more correct than B.

Selected Answer: B The dynamically-learned MAC address feature lets the switch learn the MAC addresses of devices connected to its ports as traffic moves through the network.

Selected Answer: B 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 read it as "each connecting device" (probably the intended meaning), then the idea becomes valid: Switches dynamically learn the MAC addresses of connected devices by looking at incoming frames. A. Factually correct: Yes, the CAM table is empty at first and is filled only when traffic enters the port. However: This explains a detail of how the feature works, not a full answer to the question "how does the feature function." It's an effect, not a definition of the feature. The correct answer is: B.

Selected Answer: A The correct answer is A

Selected Answer: A I'm kind of surprised how many people think it is B. A CAM table (aka MAC table) is a table on a switch that links the MAC address of the device connected on each port. As traffic comes in from each port (ingress), the switch will update it's CAM table with the source address of the frame. It's really 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.

Selected Answer: A The answer is A.