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
A is more suitable
When a switch is powered on or reset, its Content Addressable Memory (CAM) table, which stores MAC address/port mappings, is initially empty.
As traffic enters each port (ingress traffic), the switch dynamically learns and records the MAC addresses of the devices connected to those ports.
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.
Option B is correct because switches dynamically learn the MAC addresses of each connecting device and store them in the CAM table.
Option C is incorrect because there is no maximum limit to the number of dynamically-learned MAC addresses that can be stored in the CAM table.
Option D is incorrect because the dynamically-learned MAC address feature does not require a minimum number of secure MAC addresses to be filled dynamically. However, switches may have features that allow for the restriction of MAC addresses to only those that are secure, such as MAC address filtering or port security.
sorry, i have missreaded, Switch dosen´t learn MAC addresses from EACH CONNECTING CAM table, if it was from each connecting device then it would be correct.
so A is more suitable here
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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