The answer is to configure 'errdisable recovery cause psecure-violation' on the Cisco Nexus 9000 switch. This command enables automatic recovery from the err-disabled state triggered by a port-security violation, allowing the port to come back up after the default 300-second interval without manual intervention, thus restoring connectivity for the two authorized devices while preserving the security posture of limiting MAC addresses to two. On the Cisco DCCOR and CCNP Data Center Core 350-601 exam, this scenario tests your understanding of the errdisable recovery mechanism versus manual recovery methods like 'shutdown/no shutdown'—a common trap is assuming sticky MAC addresses alone prevent violations, but they do not override the violation action. Remember the memory tip: "psecure-violation" pairs with "errdisable recovery" to automate port revival, saving you from manual resets.
350-601 Security Practice Question
This 350-601 practice question tests your understanding of security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer is implementing port security on a Cisco Nexus 9000 switch to limit the number of MAC addresses learned on a single access port. The switchport is configured as follows:
After connecting two authorized devices, a third unauthorized device is connected, causing the port to enter the err-disabled state. The engineer needs to restore connectivity for the two authorized devices as quickly as possible, while maintaining the security posture. What is the best practice to recover the port automatically in the future?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure 'errdisable recovery cause psecure-violation' to automatically recover the port after the configured interval.
Option C is correct because the 'errdisable recovery cause psecure-violation' command enables automatic recovery from the err-disabled state caused by a port-security violation. This allows the port to come back up after a default or configured interval (typically 300 seconds) without manual intervention, restoring connectivity for the two authorized devices while maintaining the security posture of limiting MAC addresses to two.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Manually shut down and then no shutdown the interface to recover from err-disabled state.
Why it's wrong here
Manual recovery is not automatic and requires intervention; best practice is autorecovery.
✗
Remove port-security configuration entirely to prevent future err-disables.
Why it's wrong here
This removes the security protection.
✓
Configure 'errdisable recovery cause psecure-violation' to automatically recover the port after the configured interval.
Why this is correct
This automatically brings the port out of errdisabled state after a timer, maintaining security while enabling quick recovery.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the maximum MAC address limit to 3 to accommodate the third device.
Why it's wrong here
This would allow the unauthorized device, defeating security.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between manual recovery (shut/no shut) and automatic recovery (errdisable recovery), and the trap here is that candidates may choose manual recovery as 'quickest' without realizing the question asks for automatic future recovery, or they may incorrectly think increasing the MAC limit is a valid security compromise.
Detailed technical explanation
How to think about this question
The 'errdisable recovery cause psecure-violation' command relies on the errdisable recovery timer, which by default is 300 seconds but can be adjusted with 'errdisable recovery interval <seconds>'. Under the hood, when a port-security violation occurs, the switch sets the port to err-disabled state and stops forwarding traffic; the recovery mechanism periodically checks the cause and re-enables the port if the timer expires, but the sticky MAC addresses remain in the running configuration, ensuring only the authorized devices can connect again.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure 'errdisable recovery cause psecure-violation' to automatically recover the port after the configured interval. — Option C is correct because the 'errdisable recovery cause psecure-violation' command enables automatic recovery from the err-disabled state caused by a port-security violation. This allows the port to come back up after a default or configured interval (typically 300 seconds) without manual intervention, restoring connectivity for the two authorized devices while maintaining the security posture of limiting MAC addresses to two.
What should I do if I get this 350-601 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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