PCNSE Core Concepts and Architecture Practice Question
A company needs to deploy a firewall in transparent inline mode to filter traffic between two switches without requiring any IP address changes on existing devices. Which interface type should be configured?
⚠ Common exam trap
Watch out — candidates often confuse Layer2 interfaces with Virtual Wire, assuming any transparent mode works the same, but Layer2 interfaces require bridge groups or VLAN configuration and do not provide the same zero-touch inline deployment as Virtual Wire.
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 (VWire) is the correct interface type because it allows the firewall to operate in transparent inline mode without requiring any IP address changes on existing devices. In VWire mode, the firewall acts as a Layer 2 bump in the wire, forwarding traffic between two interfaces based on MAC addresses without participating in routing or requiring IP configuration on the firewall interfaces themselves.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Virtual Wire
Why this is correct
Virtual Wire bridges two ports without IP, providing transparent inline inspection.
- ✗
Tap
Why it's wrong here
Tap interface is for monitoring only, not inline filtering.
- ✗
Layer3
Why it's wrong here
Layer3 interfaces require IP configuration and are not transparent.
- ✗
Layer2
Why it's wrong here
Layer2 can be transparent but requires a management IP and is less efficient than Virtual Wire.
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 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.