easyMultiple Choice
PCNSA Practice Question: Deploy a Palo Alto Networks firewall in a…
An administrator needs to deploy a Palo Alto Networks firewall in a location where the network infrastructure does not support routing. The firewall must be transparent to the existing network. Which deployment mode should be used?
⚠ Common exam trap
Many candidates confuse Tap mode with transparent deployment, but Tap mode is passive and cannot enforce security policies inline, whereas virtual wire mode provides full inline inspection while remaining transparent to the network.
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
✓
Virtual wire
Virtual wire mode allows the firewall to be deployed transparently without requiring any routing configuration, as it operates at Layer 2 by binding two interfaces together and forwarding traffic based on MAC addresses. This mode is ideal when the existing network infrastructure does not support routing and the firewall must be invisible to the network, as it does not participate in routing protocols or require IP addresses on the connected interfaces.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
HA mode
Why it's wrong here
HA mode describes redundancy between two firewalls, not how a single firewall forwards traffic; it presupposes an underlying Layer 2 or Layer 3 deployment. It is correct when resilience against device failure is required, but it does not satisfy the transparency requirement in a non-routing network.
- ✓
Virtual wire
Why this is correct
Virtual wire mode binds two interfaces into a transparent pair, forwarding frames without IP addressing or routing. This satisfies the constraint that the existing infrastructure lacks routing support while keeping the firewall invisible to the network.
- ✗
Layer 3
Why it's wrong here
Layer 3 mode requires IP addressing and routing between interfaces, which the stated infrastructure cannot provide. It is the standard choice when the firewall acts as a routed gateway between subnets, but transparency to an existing network with no routing changes requires Layer 2 virtual wire instead.
- ✗
Tap mode
Why it's wrong here
Tap mode mirrors copies of packets to a monitoring interface for visibility only; it never sits inline, so it cannot enforce policy or forward traffic transparently. It suits passive analysis alongside an existing firewall, whereas a transparent inline requirement demands Layer 2 virtual wire behaviour.
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 |
Go deeper
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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.