Cisco Certified Network Professional Practice Test

How can you view ports that are in an err-disabled state?

1. show port-security errors

2. show interfaces status

3. show interfaces status err-disabled

4. show err-disabled ports

The correct answer is: show interfaces status err-disabled

To view ports that are in an err-disabled state, the command to use is 'show interfaces status err-disabled.' This command specifically focuses on the interface status and filters the output to display only those interfaces that are currently disabled due to an error condition. When a port is err-disabled, it typically indicates that it has been automatically shut down due to a specific issue, such as a security violation or a link flapping. Utilizing this command allows network administrators to quickly identify affected interfaces and investigate the reasons behind the state, which is crucial for troubleshooting connectivity issues in a network environment. The administrative clarity gained from this command helps in efficiently resolving problems that lead to ports being placed in err-disabled status. Other commands that could be considered might provide broader status information about interfaces, but they would not specifically isolate those that are err-disabled, thereby making it less effective for your immediate needs when diagnosing port states.