CCNA: Cisco Certified Network Associate — Question 1124

What causes a port to be placed in the err-disabled state?

Answer options

• A. shutdown command issued on the port
• B. port security violation
• C. nothing plugged into the port
• D. latency

Correct answer: B

Explanation

A port is placed in the err-disabled state primarily due to a port security violation, which occurs when the number of MAC addresses exceeds the configured limit. The other options, like the shutdown command or latency, do not directly cause a port to transition to this state.