CCNA: Cisco Certified Network Associate — Question 1368

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

Answer options

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

Correct answer: B

Explanation

The correct answer is B, as link flapping occurs when the link state changes rapidly, causing the port to enter the err-disabled state to prevent network instability. Options A and D do not directly cause the err-disabled state, and C, while related to performance, does not trigger this specific condition.