PCNSE Core Concepts and Architecture Practice Question
A network security engineer is deploying a Palo Alto Networks firewall in a high-availability (HA) active/passive configuration. The engineer wants to ensure that the passive firewall takes over seamlessly if the active firewall fails. Which of the following is a requirement for HA active/passive configuration?
⚠ Common exam trap
The trap here is thinking that the active firewall must have a higher priority, but priority is only used for election and does not define the active/passive role.
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
✓
Both firewalls must have identical hardware models and software versions.
For HA active/passive, both firewalls must be identical in hardware model and PAN-OS software version to ensure compatibility and seamless failover. The passive firewall synchronizes configuration from the active firewall, so security policies are the same. Each firewall needs a unique management IP for separate management. Priority values are used for election but are not required to be higher on the active firewall. The passive firewall does not have a separate blocking policy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The active firewall must have a higher priority value than the passive firewall.
Why it's wrong here
In HA active/passive, priority values are used to determine which firewall becomes active in case of a tie or when both are up. However, it is not a requirement that the active firewall has a higher priority; the passive firewall could have a higher priority but still be passive due to other factors like preemption or link status. The priority is used for election, but the active/passive state is determined by the HA election process. Therefore, this is not a strict requirement.
- ✗
Both firewalls must be configured with the same management IP address.
Why it's wrong here
In HA configuration, each firewall must have a unique management IP address to allow separate management access. If they shared the same management IP, it would cause an IP conflict on the network. The HA pair uses dedicated HA interfaces for communication and synchronization, not the management interface. Therefore, identical management IPs are not required and would actually prevent proper management.
- ✓
Both firewalls must have identical hardware models and software versions.
Why this is correct
For HA active/passive, both firewalls must be the same hardware model and run the same PAN-OS software version. This ensures that the passive firewall can take over without compatibility issues. If the models or software versions differ, the HA pair may not form, or failover may not work correctly. Identical hardware and software also ensure consistent performance and feature support. While some platforms allow mixed models in HA, it is not recommended and may not be supported. For seamless failover, identical configurations are essential.
- ✗
The passive firewall must have a separate security policy that blocks all traffic.
Why it's wrong here
In HA active/passive, the passive firewall synchronizes the configuration from the active firewall, including security policies. It does not have a separate policy that blocks all traffic. The passive firewall is in a standby state and does not process traffic, but it maintains the same configuration to take over seamlessly. If it had a different policy, failover would result in inconsistent security enforcement. Therefore, this is incorrect.
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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.