PCNSE Practice Question: Managing Troubleshooting and High Availability
A medium-sized enterprise has two Palo Alto Networks PA-5250 firewalls configured in an active/passive HA pair with session synchronization and configuration synchronization enabled. The HA1 link is a direct copper cable, and the HA2 link is also a direct copper cable. The firewalls are connected to two upstream routers (R1 and R2) and two downstream switches (S1 and S2). The network uses OSPF for dynamic routing. The active firewall (FW-A) is connected to R1 and S1, while the passive firewall (FW-P) is connected to R2 and S2. The OSPF cost is set symmetrically on both sides. During a maintenance window, the network team shuts down the HA1 and HA2 links on both firewalls to test failover behavior. After the links are brought back up, the firewalls are in a state of 'non-functional' and 'suspended'. The team suspects the HA configuration is broken. What is the most likely cause and the best course of action to restore HA?
⚠ Common exam trap
Many exam-takers assume re-establishing the HA links alone will automatically restore the HA pair, but PAN-OS requires a full reboot of both firewalls to clear the suspended state after a simultaneous HA link failure, as the state machine does not have a built-in recovery mechanism for this scenario.
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
✓
Reboot both firewalls after verifying the HA configuration and that the links are operationally up
When both HA1 and HA2 links are simultaneously shut down on both firewalls, the active/passive pair loses all communication and session synchronization. Upon restoration, the firewalls enter a 'non-functional' and 'suspended' state because the HA control plane cannot re-establish a quorum or verify the peer's state without a full reset of the HA state machine. Rebooting both firewalls after verifying the HA configuration and that the links are operationally up forces a clean initialization of the HA process, clearing the suspended state and allowing the pair to renegotiate roles correctly.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Upgrade both firewalls to the same software version and then re-initialize HA
Why it's wrong here
Software version is assumed same; re-initializing may help but the root cause is not software version.
- ✗
Change the HA mode to active/active and enable asymmetric routing
Why it's wrong here
Does not resolve the suspended state.
- ✓
Reboot both firewalls after verifying the HA configuration and that the links are operationally up
Why this is correct
Rebooting recovers from suspended state; links are up now.
- ✗
Configure a dedicated management interface for HA1 communication and ensure HA2 is on a different subnet
Why it's wrong here
HA1 and HA2 must be on the same subnet; this suggestion is incorrect and does not fix suspension.
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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.