PCNSE Core Concepts and Architecture Practice Question
A network administrator is configuring a new Palo Alto Networks firewall in a high-availability active/passive setup. The firewall will be placed in Layer 3 mode. Which THREE steps are required to ensure proper operation? (Choose three.)
⚠ Common exam trap
Watch out — candidates often think aggregate Ethernet or management profiles are mandatory for HA or Layer 3 operation, but they are optional features that do not affect basic routing or HA failover functionality.
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
✓
Configure a virtual router and assign interfaces
In Layer 3 mode, a virtual router must be configured to enable the firewall to participate in IP routing. The virtual router handles route learning, static routes, and route redistribution, and each Layer 3 interface must be assigned to a virtual router to forward traffic. Without this, the firewall cannot route packets between zones.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure a virtual router and assign interfaces
Why this is correct
Virtual router is required for Layer 3 routing.
- ✓
Configure the HA1 link and HA1 backup link
Why this is correct
HA1 is required for control communication; backup is recommended.
- ✗
Enable aggregate Ethernet on all interfaces
Why it's wrong here
Aggregate Ethernet is not required for basic HA operation.
- ✗
Set up a management profile for each interface
Why it's wrong here
Management profile is optional and not required for HA.
- ✓
Configure a floating IP for the active firewall
Why this is correct
Floating IP ensures seamless failover.
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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.