- A
Both firewalls must be from different hardware families
Why wrong: They must be the same model (e.g., both PA-3220).
- B
The firewalls must be connected via a dedicated HA link using the management port
Why wrong: The HA link can use dedicated ports but not necessarily the management port; typically data interfaces.
- C
Firewalls in an HA pair must be on the same network segment for failover
Both firewalls share the same IP addresses for virtual IPs; they need Layer 2 adjacency.
- D
The firewalls must have layer 2 connectivity for heartbeats
Heartbeat is sent over the HA link, which requires Layer 2 connectivity.
- E
Both firewalls must be running the same PAN-OS version
Version consistency is required for HA synchronization.
Question 113 of 529
PCNSA Palo Alto Networks Platforms and Architecture Practice Question
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 THREE of the following are requirements for configuring High Availability (HA) on Palo Alto Networks firewalls?
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
✓
Firewalls in an HA pair must be on the same network segment for failover
Option C is correct because for HA failover to function properly, both firewalls must reside on the same Layer 2 network segment. This ensures that when the active firewall fails, the passive firewall can assume the same IP addresses and MAC addresses without requiring ARP updates or routing changes, enabling seamless traffic 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 be from different hardware families
Why it's wrong here
They must be the same model (e.g., both PA-3220).
- ✗
The firewalls must be connected via a dedicated HA link using the management port
Why it's wrong here
The HA link can use dedicated ports but not necessarily the management port; typically data interfaces.
- ✓
Firewalls in an HA pair must be on the same network segment for failover
Why this is correct
Both firewalls share the same IP addresses for virtual IPs; they need Layer 2 adjacency.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The firewalls must have layer 2 connectivity for heartbeats
Why this is correct
Heartbeat is sent over the HA link, which requires Layer 2 connectivity.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Both firewalls must be running the same PAN-OS version
Why this is correct
Version consistency is required for HA synchronization.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the dedicated HA link requirement with the management port, incorrectly assuming the MGT port can be used for HA heartbeats, when in fact only a dedicated data-plane interface or HA-specific port is supported.
Detailed technical explanation
How to think about this question
HA heartbeats are sent over the dedicated HA link using UDP port 29260 (for control link) and optionally over the data link for packet forwarding state synchronization. The firewalls exchange keepalive messages every 1 second by default, and if three consecutive heartbeats are missed (3-second hold timer), failover is triggered. In a real-world scenario, if the HA link is not on the same Layer 2 segment, the passive firewall cannot assume the active firewall's MAC address, causing traffic blackholing during failover.
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 practitioner preparing for the PCNSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Palo Alto Networks Platforms and Architecture — This question tests Palo Alto Networks Platforms and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Firewalls in an HA pair must be on the same network segment for failover — Option C is correct because for HA failover to function properly, both firewalls must reside on the same Layer 2 network segment. This ensures that when the active firewall fails, the passive firewall can assume the same IP addresses and MAC addresses without requiring ARP updates or routing changes, enabling seamless traffic failover.
What should I do if I get this PCNSA 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.
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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: Jun 25, 2026
This PCNSA 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 PCNSA exam.
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