C, by mapping source MAC address and port ID switches know how to send packets on a local network , it creates the CAM table . show mac-addresses command on a Cisco SW .
OK it´s weird Question and Answers, but im going with C.
Why not B?
Because MAC address learning doesn´t directly increase security on the management VLAN.
While MAC address learning is crucial for proper network operation, it does not inherently enhance security on the management VLAN. Security on the management VLAN is typically enforced through other means, such as access control lists (ACLs), VLAN segmentation, authentication mechanisms, encryption protocols, and strict management policies.
a few weeks ago when i was lab configuring on udemy courses, theres a part where you can enable how many mac addresses can be learnt at max and if you exceed the max a violation occurs and this shuts off the interface. I forgot what i was called it may be a syslog but this is why i went with be because that is a key function. Also i work ona military base and this is their setup becuase they do not want unknown devices on their network.
I understand your perspective and you have right on this one. but the feature you're referring to is likely port security, which is a mechanism used to restrict the number of MAC addresses that can be learned on a switch port. When the maximum number of MAC addresses is exceeded, a violation occurs, and depending on the configuration (protect or restrict), the interface can be shut down or other actions can be taken, such as sending an SNMP trap.
Given your context of working on a military base where strict security measures are enforced, enabling port security to control access to the network makes sense.
However, in the context of the question about MAC address learning, the function itself refers to the basic operation of switches to associate MAC addresses with port locations for forwarding frames efficiently. Therefore, while port security is indeed an important feature for network security, it's not the same as MAC address learning.
This is a terrible, terrible question. I don't know where these questions are sourced, but I doubt Cisco is so terrible as to write something this bad.
I'm gonna throw a curveball though and say it's B. First, let's look at the wrong answers:
A -> This just isn't true.
C -> This *is* true, but it's not a function.
D -> This is the opposite of what it does; MAC address learning *prevents* flooding.
So why C?
"If you disable MAC address learning on a VLAN with more than two ports, every packet entering the switch is flooded in that VLAN domain."
Flooding means that the packet will be sent to devices other than its intended destination, thereby violating the "confidentiality" element of the CIA triad and reducing the security on the management VLAN.
But yeah, they probably just wrote the question wrong and the answer they want is "C".
Answers A and C negates each other and are not functions.
Answer D states a threat and is therefore obviously incorrect.
That leaves us with B, which is an actual function.
By default, MAC address learning is enabled on all interfaces and VLANs on the router.
https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/www.cisco.com/content/en/us/td/docs/wireless/mwr_2941_dc/software_config/guide/3_5_1/2941_351_ConfigGuide/mac_lrn.html.xml#:~:text=By%20default%2C%20MAC%20address%20learning,VLANs%20can%20learn%20MAC%20addresses.
hhhhhh i am sorry i am laughing but i couldn't help it. what is the function of Mac address learning, it is enabled on all vlan's . really?
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