NGFW-Engineer PAN OS Device Setting Configuration Practice Question
A network administrator needs to ensure that internal users can access a public-facing web server located in the DMZ using its public IP address (Hairpin NAT). The policy exists, but traffic is being dropped. Which configuration step is critical to enable this?
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
✓
The NAT rule must have the destination zone set to the DMZ and the source interface as the internal interface.
Hairpin NAT requires the security policy to allow the traffic into the zone where the server resides and for the NAT rule to be correctly configured with the source zone set to the internal zone.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The NAT rule must have the destination zone set to the DMZ and the source interface as the internal interface.
Why this is correct
For hairpin NAT, the firewall must be able to route the traffic from the internal zone back into the DMZ zone via a NAT policy that matches the source/destination criteria.
- ✗
Enable 'Disable Server Response Inspection' on the NAT policy.
Why it's wrong here
This setting does not enable hairpinning and is generally used for specific protocol compatibility issues.
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Set the security policy action to 'Allow' and enable 'Source Translation'.
Why it's wrong here
While source translation might be involved, the core issue is usually the zone selection and routing policy for hairpin traffic.
- ✗
Configure an external Proxy ARP entry for the public IP address.
Why it's wrong here
Proxy ARP is for local segment address resolution, not for facilitating internal-to-DMZ NAT traffic.
Visual reference
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Palo Alto Networks exam blueprint
This NGFW-Engineer 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 NGFW-Engineer exam.