- A
Virtual Wire
Virtual Wire bridges two ports without IP, providing transparent inline inspection.
- B
Tap
Why wrong: Tap interface is for monitoring only, not inline filtering.
- C
Layer3
Why wrong: Layer3 interfaces require IP configuration and are not transparent.
- D
Layer2
Why wrong: Layer2 can be transparent but requires a management IP and is less efficient than Virtual Wire.
Question 130 of 516
Virtual Wire — Transparent Inline Mode Deployment
This PCNSE practice question tests your understanding of core concepts and architecture. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
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?
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.
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.
- ✓
Virtual Wire
Why this is correct
Virtual Wire bridges two ports without IP, providing transparent inline inspection.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates 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.
Detailed technical explanation
How to think about this question
Virtual Wire interfaces pair two firewall ports into a logical wire, forwarding frames based on MAC learning and a simple forwarding table, with no spanning tree or routing involvement. A subtle behavior is that VWire supports jumbo frames and can enforce security policies on non-IP protocols (e.g., MPLS, PPPoE) because it operates at Layer 2, making it ideal for transparent inspection in environments where IP renumbering is impossible. In real-world scenarios, VWire is often used to insert a firewall into an existing data center leaf-spine fabric without disrupting the Layer 2 topology.
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 PCNSE 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 PCNSE question test?
Core Concepts and Architecture — This question tests Core Concepts and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this PCNSE 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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Last reviewed: Jun 25, 2026
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.
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