NGFW-Engineer PAN OS Networking Configuration Practice Question
A administrator needs to allow traffic between two zones using a specific sub-interface. Which configuration step is mandatory?
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
✓
Assign the sub-interface to a security zone
Interfaces must be assigned to a security zone before they can be referenced in a security policy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add the sub-interface to the default zone
Why it's wrong here
There is no 'default' zone; you must create or select an existing zone.
- ✓
Assign the sub-interface to a security zone
Why this is correct
Zone assignment is mandatory for all interface types.
- ✗
Configure the sub-interface as a loopback
Why it's wrong here
Sub-interfaces are Ethernet links, not loopbacks.
- ✗
Enable DHCP server on the sub-interface
Why it's wrong here
DHCP is optional and unrelated to policy enforcement.
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.