CCNA: Cisco Certified Network Associate — Question 882

What does a switch use to build its MAC address table?

Answer options

• A. VTP
• B. DTP
• C. ingress traffic
• D. egress traffic

Correct answer: C

Explanation

A switch builds its MAC address table by examining ingress traffic, which includes frames entering the switch and their source MAC addresses. The other options, VTP and DTP, are protocols for managing VLANs and trunking, and egress traffic refers to outgoing frames, which do not contribute to building the MAC address table.