- A
Both firewalls have the same priority and no preemptive is enabled; configure different priorities and enable preemptive.
Equal priority with no preemptive causes both to remain passive. Differing priorities with preemptive allow one to become active.
- B
The HA firewall link is down; check and reconnect the Layer 2 link between the firewalls.
Why wrong: Link status would be reflected in command output and is unlikely to cause both to be passive.
- C
The HA configuration is missing a heartbeat interface; add a dedicated heartbeat interface.
Why wrong: Heartbeat interface absence would show link down issues, not both passive.
- D
The preemptive settings are misconfigured; change the priority to make one firewall active.
Why wrong: If priorities are the same, changing one priority may help, but enabling preemptive ensures automatic takeover.
Quick Answer
The answer is that both firewalls have the same priority and preemptive is not enabled, so configuring different priorities and enabling preemptive resolves the issue. This occurs because in an active/passive HA pair, the firewalls use priority values to elect an active device; when both have identical priorities and preemptive is disabled, neither firewall can claim the active role after a reboot, leaving both stuck in a passive state unable to pass traffic. On the Palo Alto Networks Certified Network Security Administrator PCNSA exam, this scenario tests your understanding of HA election mechanics and the importance of preemptive settings, often appearing as a troubleshooting trap where candidates overlook the need for distinct priorities. A common memory tip is to think of a tiebreaker: without a clear winner (different priority) and a rule to enforce it (preemptive), both devices remain passive, like two referees waiting for the other to blow the whistle.
PCNSA Palo Alto Networks Platforms and Architecture Practice Question
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 large enterprise operates multiple data centers with a Palo Alto Networks firewall pair in each data center in active/passive HA. The firewalls are managed by Panorama. Recently, after a power outage in Data Center A, both firewalls in that data center came back online but are not passing traffic. The network team confirms that the switches and routers are operational. The Panorama administrator sees that both firewalls are connected and show green in the Managed Devices tab. However, the active firewall in Data Center A shows "HA state: passive" and the other firewall also shows "passive". The administrator suspects a configuration issue. What is the most likely cause and corrective action?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Both firewalls have the same priority and no preemptive is enabled; configure different priorities and enable preemptive.
In an active/passive HA pair, if both firewalls show 'passive', it typically means they cannot determine which should be active. This occurs when both have the same priority and preemptive is disabled, so neither can claim the active role after a reboot. Configuring different priorities and enabling preemptive ensures one firewall becomes active based on its higher priority (lower numerical value).
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.
- ✓
Both firewalls have the same priority and no preemptive is enabled; configure different priorities and enable preemptive.
Why this is correct
Equal priority with no preemptive causes both to remain passive. Differing priorities with preemptive allow one to become active.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The HA firewall link is down; check and reconnect the Layer 2 link between the firewalls.
Why it's wrong here
Link status would be reflected in command output and is unlikely to cause both to be passive.
- ✗
The HA configuration is missing a heartbeat interface; add a dedicated heartbeat interface.
Why it's wrong here
Heartbeat interface absence would show link down issues, not both passive.
- ✗
The preemptive settings are misconfigured; change the priority to make one firewall active.
Why it's wrong here
If priorities are the same, changing one priority may help, but enabling preemptive ensures automatic takeover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a missing heartbeat interface or a link failure causes both firewalls to be passive, but in reality those scenarios cause split-brain (both active) or HA not forming, not both passive.
Trap categories for this question
Command / output trap
Link status would be reflected in command output and is unlikely to cause both to be passive.
Detailed technical explanation
How to think about this question
In Palo Alto Networks HA, the active/passive election uses a combination of priority (1–65535, lower is higher priority) and preemptive setting. When preemptive is disabled, the first firewall to boot becomes active and retains that role until a failure occurs. After a simultaneous reboot, both firewalls boot with the same priority and no preemptive, so neither can claim active—they both remain passive. Enabling preemptive with different priorities ensures the higher-priority firewall takes over after a reboot or reconnection.
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 practitioner preparing for the PCNSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Palo Alto Networks Platforms and Architecture — This question tests Palo Alto Networks Platforms and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Both firewalls have the same priority and no preemptive is enabled; configure different priorities and enable preemptive. — In an active/passive HA pair, if both firewalls show 'passive', it typically means they cannot determine which should be active. This occurs when both have the same priority and preemptive is disabled, so neither can claim the active role after a reboot. Configuring different priorities and enabling preemptive ensures one firewall becomes active based on its higher priority (lower numerical value).
What should I do if I get this PCNSA 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 25, 2026
This PCNSA practice question is part of Courseiva's free Palo Alto Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNSA exam.
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