SD-WAN-Engineer Planning And Design Practice Question
When setting up a branch, you need to define the 'Underlay' transport. What does this refer to?
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 physical/logical circuits provided by the ISP
The underlay refers to the raw transport provided by the ISP (e.g., MPLS, Broadband).
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 physical/logical circuits provided by the ISP
Why this is correct
Underlay is the physical transport layer.
- ✗
The internal VLAN structure
Why it's wrong here
VLANs are internal LAN constructs.
- ✗
The encrypted VPN tunnels
Why it's wrong here
That is the overlay.
- ✗
The routing protocol used internally
Why it's wrong here
That is internal routing.
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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 SD-WAN-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 SD-WAN-Engineer exam.