NSE7 Advanced Networking and SD-WAN Practice Question
A FortiGate is connected to a FortiExtender via USB. The administrator wants to use LTE as a backup WAN link in an SD-WAN setup. After configuring the FortiExtender, the LTE interface is not showing up as an SD-WAN member. What is the most likely reason?
⚠ Common exam trap
It's easy for candidates to assume the LTE interface will appear automatically once the FortiExtender is physically connected and configured, overlooking the mandatory FortiExtender license that governs the management plane between the FortiGate and the extender.
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 FortiGate does not have a valid FortiExtender license
When a FortiGate connects to a FortiExtender via USB, the LTE interface will not appear as an SD-WAN member unless the FortiExtender is in managed mode and the FortiGate has a valid FortiExtender license. Without the license, the FortiGate cannot manage the FortiExtender or expose its LTE interface for SD-WAN membership, even if the physical connection and SIM are functional.
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 FortiExtender is not in managed mode
Why it's wrong here
Managed mode is for cloud management; the FortiGate can still see the interface.
- ✓
The FortiGate does not have a valid FortiExtender license
Why this is correct
A valid license is required for FortiExtender integration; without it, the interface may not be recognized as an SD-WAN member.
- ✗
The LTE SIM card is not activated
Why it's wrong here
Even if SIM is not active, the interface should appear as a physical interface.
- ✗
The LTE interface must be configured as a WAN link in the FortiExtender first
Why it's wrong here
The FortiExtender provides the interface; no separate configuration on the extender is needed for the FortiGate to see it.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This NSE7 practice question is part of Courseiva's free Fortinet 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 NSE7 exam.