- A
The configuration is not synchronized
Why wrong: Config sync is separate; state transition does not require it.
- B
Session synchronization is not fully complete
Why wrong: Session sync does not affect state transition.
- C
The HA2 link is down
Why wrong: HA2 link is for session sync, not state.
- D
Preemptive mode is disabled and the passive firewall has a lower priority
Without preemptive, the passive stays passive unless priority is higher.
Question 11 of 516
Preemptive Mode and Priority in Palo Alto HA Failover
This PCNSE practice question tests your understanding of managing troubleshooting and high availability. 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.
An administrator runs 'show high-availability state' and sees that the local firewall is in 'passive' state, but the remote firewall shows 'active'. However, the HA1 link is up and the configuration is synchronized. What could cause the passive firewall to not take over after the active fails?
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
✓
Preemptive mode is disabled and the passive firewall has a lower priority
Option D is correct because when preemptive mode is disabled, the passive firewall will not automatically take over as active because it has a lower priority. Without preemption, the firewall with a lower priority (higher numerical value) will not preempt the current active firewall. Additionally, since the passive firewall has a lower priority, it will remain passive even if the active firewall fails, as the preemptive mode setting prevents automatic failover based on priority. This is why the passive firewall does not take over after the active fails.
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.
- ✗
The configuration is not synchronized
Why it's wrong here
Config sync is separate; state transition does not require it.
- ✗
Session synchronization is not fully complete
Why it's wrong here
Session sync does not affect state transition.
- ✗
The HA2 link is down
Why it's wrong here
HA2 link is for session sync, not state.
- ✓
Preemptive mode is disabled and the passive firewall has a lower priority
Why this is correct
Without preemptive, the passive stays passive unless priority is higher.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume that a synchronized configuration and an up HA1 link guarantee automatic failover, but they overlook the preemptive mode setting, which controls whether the passive firewall will take over based on priority rather than just failure detection.
Detailed technical explanation
How to think about this question
In Palo Alto Networks active/passive HA, the firewall with the lower priority (higher numerical value) is passive by default. Preemptive mode, when enabled, forces the passive firewall to become active if it has a higher priority (lower numerical value) than the current active firewall. Without preemption, the passive firewall will only take over if the active firewall fails (e.g., loss of HA1 keepalive). The 'show high-availability state' command displays the local state and priority; if preemptive mode is disabled, the passive firewall will not initiate a takeover even if its priority is higher, which is a common misconfiguration in environments where priority-based failover is expected.
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 PCNSE 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.
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FAQ
Questions learners often ask
What does this PCNSE question test?
Managing Troubleshooting and High Availability — This question tests Managing Troubleshooting and High Availability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Preemptive mode is disabled and the passive firewall has a lower priority — Option D is correct because when preemptive mode is disabled, the passive firewall will not automatically take over as active because it has a lower priority. Without preemption, the firewall with a lower priority (higher numerical value) will not preempt the current active firewall. Additionally, since the passive firewall has a lower priority, it will remain passive even if the active firewall fails, as the preemptive mode setting prevents automatic failover based on priority. This is why the passive firewall does not take over after the active fails.
What should I do if I get this PCNSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This PCNSE 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 PCNSE exam.
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