CCNA: Cisco Certified Network Associate — Question 1062

How does MAC learning function?

Answer options

• A. adds unknown source MAC addresses to the CAM table
• B. protects against denial of service attacks
• C. populates the ARP table with the egress port
• D. sends an ARP request to locate unknown destinations

Correct answer: A

Explanation

The correct answer is A, as MAC learning involves adding unknown source MAC addresses to the Content Addressable Memory (CAM) table for efficient packet forwarding. Options B, C, and D do not accurately describe MAC learning; B relates to security measures, C pertains to ARP table management, and D involves ARP requests, which are separate functions.