PCNSE Practice Question: Managing Troubleshooting and High Availability
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?
⚠ Common exam trap
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.
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.
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
A sync-failure indicates the peers cannot exchange configuration data, and that exchange travels over the HA1 link. Verifying HA1 interface status and IP connectivity between peers confirms whether the dedicated synchronisation path is down before investigating deeper causes such as version mismatches or commit failures.
- ✗
Disable preemption on the active firewall
Why it's wrong here
Preemption governs which firewall resumes the active role after recovery; it has no bearing on whether configuration synchronises. Disabling it is tempting when failover behaviour looks wrong, but preemption is relevant only to role election scenarios, not to a sync-failure between peers.
- ✗
Check the HA2 link session synchronization status
Why it's wrong here
The HA2 link carries session synchronisation, not configuration, so checking it cannot resolve a configuration sync-failure. It is tempting because HA2 faults do cause failover problems, but configuration synchronisation travels over the HA1 link, which is where the fault lies.
- ✗
Reboot both firewalls to clear the failure
Why it's wrong here
Rebooting both firewalls discards evidence and risks an outage without addressing the underlying synchronisation fault. It is tempting as a quick reset, but reboots suit transient software faults; a persistent sync-failure requires inspecting HA1 connectivity, versions and commit state first.
Go deeper
Related to this question
About these practice questions
Courseiva writes every PCNSE question from scratch — 319 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.