PCNSE Practice Question: Managing Troubleshooting and High Availability
An organization has configured an active/passive high availability pair of Palo Alto Networks firewalls. During a maintenance window, the active firewall was rebooted. After the reboot, the passive firewall became active, but the session table on the original active firewall is incomplete. The administrator notices that session synchronization is not working properly. Which two configuration checks should the technician perform to resolve this issue?
⚠ Common exam trap
Candidates often confuse the HA1 and HA2 link roles, assuming that checking the HA1 link (used for heartbeats and configuration sync) will resolve session synchronization issues, when in fact session replication relies exclusively on the HA2 link.
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 that the HA2 link is operational and has sufficient bandwidth.
Session synchronization in an active/passive HA pair uses the HA2 link (or HA2 backup) to replicate session tables between firewalls. If the HA2 link is down, has insufficient bandwidth, or is misconfigured, session synchronization will fail, causing the newly active firewall to have an incomplete session table after a failover. Verifying that the HA2 link is operational and has sufficient bandwidth is therefore a critical first step in troubleshooting this issue.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check that the session synchronization encryption is disabled to reduce latency.
Why it's wrong here
Encryption is optional and does not cause sync failure; disabling it does not resolve the issue.
- ✗
Validate that the heartbeat hold timer is set to a value greater than the failover delay.
Why it's wrong here
Heartbeat hold timer influences failover timing, not session synchronization.
- ✗
Confirm that the HA1 link is using the correct IP address and is in the same subnet.
Why it's wrong here
HA1 is used for heartbeat and configuration sync, not session synchronization.
- ✓
Verify that the HA2 link is operational and has sufficient bandwidth.
Why this is correct
The HA2 link is dedicated to session synchronization; if it is down or congested, sync fails.
- ✓
Ensure that the HA firewalls have the same software version and that session synchronization is enabled in the HA configuration.
Why this is correct
Session sync must be enabled and both firewalls should run identical software to avoid compatibility issues.
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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.