CCNA: Cisco Certified Network Associate — Question 826

How does MAC learning function on a switch?

Answer options

• A. broadcasts frames to all ports without queueing
• B. sends an ARP request to locate unknown destinations
• C. adds unknown source MAC addresses to the address table
• D. sends a retransmission request when a new frame is received

Correct answer: C

Explanation

The correct answer is C because MAC learning involves a switch adding unknown source MAC addresses to its address table for future reference. Option A is incorrect as it describes a broadcasting method rather than learning. Option B is not relevant to MAC learning; it's related to address resolution. Option D pertains to frame retransmission, which is unrelated to the process of learning MAC addresses.