PCNSE Practice Question: Managing Troubleshooting and High Availability
An engineer is troubleshooting an HA pair where the passive firewall is not synchronizing sessions. The HA1 link is up and the HA state is 'passive'. The engineer notices that the HA2 link is up, but session synchronization is still not working. Which action should the engineer take next?
⚠ Common exam trap
The trap here is assuming that a functional HA2 link is sufficient for session sync, when the 'Session Synchronization' option must also be enabled.
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 'Session Synchronization' option is enabled in the HA configuration.
Session synchronization requires the 'Session Synchronization' option to be enabled. Even if the HA2 link is up, if this setting is disabled, no sessions will be synchronized. The engineer should verify this setting first. This is a common oversight when configuring HA. Once enabled, the active firewall will begin replicating sessions to the passive peer.
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 that the 'Session Synchronization' option is enabled in the HA configuration.
Why this is correct
Session synchronization must be explicitly enabled in the HA configuration for the passive firewall to receive session updates. If disabled, no sessions will sync regardless of HA2 link status. This setting is found under Device > High Availability > General > Session Synchronization. Enabling it allows the active firewall to replicate sessions to the passive peer. Without it, the passive firewall will not have current session information.
- ✗
Configure the HA2 link to use the management interface to simplify cabling.
Why it's wrong here
Using the management interface for HA2 is not supported and can cause performance degradation and security risks. HA2 should use dedicated dataplane interfaces for session synchronization. The management interface is meant for out-of-band management and does not have the throughput or reliability required for session sync. This action would not resolve the issue and is against best practices.
- ✗
Ensure that the HA1 link is encrypted with a pre-shared key.
Why it's wrong here
While HA1 encryption is a security best practice, it is not required for session synchronization. Session sync occurs over HA2. If HA1 is encrypted, it does not affect HA2 functionality. Therefore, checking HA1 encryption would not resolve a session synchronization issue. The problem lies with HA2 or session sync settings, not HA1 encryption.
- ✗
Check that the HA2 link is configured with the same IP addresses on both firewalls.
Why it's wrong here
The HA2 link uses separate IP addresses on each firewall for the HA2 interface. They must be in the same subnet but cannot be the same IP. Using identical IPs would cause an IP conflict and prevent communication. Therefore, this action is incorrect and would not resolve the issue; it would create a new problem. The HA2 interfaces should have unique IPs within the same subnet.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Palo Alto Networks exam blueprint
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.