- A
Verify HA1 link status and IP connectivity between peers
HA1 is used for configuration synchronization.
- B
Disable preemption on the active firewall
Why wrong: Preemption does not cause sync failure.
- C
Check the HA2 link session synchronization status
Why wrong: HA2 is for data, not config.
- D
Reboot both firewalls to clear the failure
Why wrong: Not a good first step.
Question 354 of 516
PCNSE Practice Question: Managing Troubleshooting and High Availability
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 engineer notices that the HA pair is not synchronizing configuration changes. The 'show high-availability sync-status' output shows 'sync-failure'. What is the first step to troubleshoot?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Verify HA1 link status and IP connectivity between peers
The 'sync-failure' status on the 'show high-availability sync-status' output indicates that configuration synchronization between the HA peers has failed. The first step in troubleshooting is to verify the HA1 link status and IP connectivity between peers because HA1 is the dedicated control link used for heartbeats and configuration sync. Without a functional HA1 link, the firewalls cannot exchange configuration data, making this the most fundamental check before investigating other potential causes.
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.
- ✓
Verify HA1 link status and IP connectivity between peers
Why this is correct
HA1 is used for configuration synchronization.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Disable preemption on the active firewall
Why it's wrong here
Preemption does not cause sync failure.
- ✗
Check the HA2 link session synchronization status
Why it's wrong here
HA2 is for data, not config.
- ✗
Reboot both firewalls to clear the failure
Why it's wrong here
Not a good first step.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often jump to checking the HA2 link (session synchronization) because they confuse configuration sync with stateful session sync, but HA1 is the correct link for configuration changes.
Detailed technical explanation
How to think about this question
The HA1 link uses UDP port 2925 for control traffic, including configuration synchronization via the 'config sync' mechanism. When 'sync-failure' appears, the active firewall cannot reach the passive peer's HA1 IP address, often due to a misconfigured IP, a down interface, or a firewall rule blocking the traffic. In real-world scenarios, this can also occur if the HA1 link is shared with data traffic and becomes congested, causing heartbeat loss and sync failures.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Managing Troubleshooting and High Availability — study guide chapter
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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: Verify HA1 link status and IP connectivity between peers — The 'sync-failure' status on the 'show high-availability sync-status' output indicates that configuration synchronization between the HA peers has failed. The first step in troubleshooting is to verify the HA1 link status and IP connectivity between peers because HA1 is the dedicated control link used for heartbeats and configuration sync. Without a functional HA1 link, the firewalls cannot exchange configuration data, making this the most fundamental check before investigating other potential causes.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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