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PCNSA Practice Question: Which THREE of the following are requirements for…
Which THREE of the following are requirements for configuring High Availability (HA) on Palo Alto Networks firewalls?
⚠ Common exam trap
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.
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
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.
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.
- ✓
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.
- ✓
Both firewalls must be running the same PAN-OS version
Why this is correct
Version consistency is required for HA synchronization.
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 |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.