NSE7 Advanced Networking and SD-WAN Practice Question
A FortiGate with FortiExtender is using LTE as a backup WAN link. When the primary link fails, the LTE link does not take over. What could be the cause?
⚠ Common exam trap
It's easy for candidates to assume any working backup interface will automatically take over when the primary fails, but FortiGate SD-WAN requires explicit membership in the SD-WAN zone for failover to occur.
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 LTE interface is not added as an SD-WAN member.
For an LTE interface to be used as a backup WAN link in an SD-WAN setup, it must be explicitly added as an SD-WAN member. Without this, the FortiGate will not consider the LTE interface for traffic steering or failover, even if the primary link fails. The SD-WAN rules and performance SLA are only evaluated against interfaces that are members of the SD-WAN 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 primary link's performance SLA is still passing.
Why it's wrong here
If primary fails, SLA should fail.
- ✗
The FortiExtender is not configured in pass-through mode.
Why it's wrong here
Pass-through affects how the extender is managed, not failover.
- ✗
The FortiExtender firmware is out of date.
Why it's wrong here
Firmware may cause issues but not specifically failover.
- ✓
The LTE interface is not added as an SD-WAN member.
Why this is correct
Without adding to SD-WAN, the backup link won't be used for failover.
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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.