CCNA: Cisco Certified Network Associate — Question 1033

How does MAC learning function?

Answer options

• A. enabled by default on all VLANs and interfaces
• B. increases security on the management VLAN
• C. sends frames with unknown destinations to a multicast group
• D. inspects and drops frames from unknown destinations

Correct answer: A

Explanation

The correct answer is A because MAC learning is typically enabled by default on all VLANs and interfaces to facilitate dynamic address learning. Options B, C, and D do not accurately describe MAC learning; B incorrectly attributes a security feature, C misrepresents how unknown destinations are handled, and D suggests dropping frames, which is not the primary function of MAC learning.