CCNA: Cisco Certified Network Associate — Question 506

What is the default port-security behavior on a trunk link?

Answer options

• A. It places the port in the err-disabled state if it learns more than one MAC address.
• B. It causes a network loop when a violation occurs.
• C. It disables the native VLAN configuration as soon as port security is enabled.
• D. It places the port in the err-disabled state after 10 MAC addresses are statically configured.

Correct answer: A

Explanation

The correct answer is A because the default behavior of port security on a trunk link is to disable the port if it detects more than one MAC address, putting it into the err-disabled state. Options B and C are incorrect as they describe behaviors that do not occur by default, and option D is wrong because it incorrectly states the number of MAC addresses for triggering the err-disabled state.