- A
Both firewalls must have management IPs in different subnets
Why wrong: They must be in the same subnet for HA1 communication.
- B
Both firewalls must have the same interface naming
Why wrong: Interface naming can vary as long as the configuration matches.
- C
Both firewalls must have the same licenses
Why wrong: Licenses can differ; HA does not require identical licenses.
- D
Both firewalls must run the same software version
Same PAN-OS version is required.
- E
Both firewalls must be the same model
Different models are not supported for HA.
Question 164 of 516
PCNSE Practice Question: Managing Troubleshooting and High Availability
This PCNSE practice question tests your understanding of managing troubleshooting and high availability. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO of the following are prerequisites for configuring high availability on Palo Alto Networks firewalls? (Choose two.)
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 run the same software version
Option D is correct because both firewalls in a high availability (HA) pair must run the same PAN-OS software version to ensure configuration synchronization and stateful failover compatibility. The HA synchronization process uses the HA2 link to replicate configurations and session state, and version mismatches can cause sync failures or unexpected behavior during failover.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Both firewalls must have management IPs in different subnets
Why it's wrong here
They must be in the same subnet for HA1 communication.
- ✗
Both firewalls must have the same interface naming
Why it's wrong here
Interface naming can vary as long as the configuration matches.
- ✗
Both firewalls must have the same licenses
Why it's wrong here
Licenses can differ; HA does not require identical licenses.
- ✓
Both firewalls must run the same software version
Why this is correct
Same PAN-OS version is required.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Both firewalls must be the same model
Why this is correct
Different models are not supported for HA.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common pitfall is assuming that different models can form an HA pair as long as they run the same PAN‑OS version, but Palo Alto Networks requires both firewalls to be the exact same model for HA.
Detailed technical explanation
How to think about this question
Under the hood, HA pairs use a dedicated HA1 link for control traffic (heartbeat, configuration sync) and an optional HA2 link for session state synchronization. The PAN-OS version must match exactly because the configuration schema and state format change between versions; even a minor version difference can break sync. In a real-world scenario, upgrading one firewall without the other will cause HA to break, requiring a maintenance window to upgrade both to the same version.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Managing Troubleshooting and High Availability — study guide chapter
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FAQ
Questions learners often ask
What does this PCNSE question test?
Managing Troubleshooting and High Availability — This question tests Managing Troubleshooting and High Availability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Both firewalls must run the same software version — Option D is correct because both firewalls in a high availability (HA) pair must run the same PAN-OS software version to ensure configuration synchronization and stateful failover compatibility. The HA synchronization process uses the HA2 link to replicate configurations and session state, and version mismatches can cause sync failures or unexpected behavior during failover.
What should I do if I get this PCNSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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.
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