NSE7 Advanced Networking and SD-WAN Practice Question
An administrator is troubleshooting an SD-WAN deployment where traffic from the branch to the datacenter is being sent over the backup LTE link even though the primary MPLS link has low latency and jitter. The SD-WAN rule uses 'Best Quality' strategy with latency and jitter metrics. The performance SLA for MPLS shows 'alive'. Which TWO configurations could cause this behavior?
⚠ Common exam trap
It's easy for candidates to assume 'Best Quality' strategy always evaluates all interfaces, but they overlook that the 'set member' configuration explicitly limits which interfaces the rule can use, overriding the strategy's dynamic selection.
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 SD-WAN rule has 'set member' configured to only include LTE.
If the SD-WAN rule uses 'set member' to include only the LTE interface, traffic will be forced over LTE regardless of the performance SLA status or the 'Best Quality' strategy. This overrides the dynamic path selection logic, causing the backup link to be used even when the primary MPLS link is healthy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BFD is enabled on MPLS but not on LTE.
Why it's wrong here
BFD does not affect SLA-based selection.
- ✓
The SD-WAN rule has 'set member' configured to only include LTE.
Why this is correct
If MPLS is not listed as a member in the rule, it won't be used.
- ✓
The performance SLA is not associated with the SD-WAN rule.
Why this is correct
Without an associated SLA, the rule cannot use SLA metrics to select the best member; it may default to a different behavior.
- ✗
The route to the datacenter is learned via OSPF with a lower cost over LTE.
Why it's wrong here
SD-WAN rules override routing table decisions; the cost of OSPF routes does not affect SD-WAN member selection.
- ✗
The latency threshold is set too low for MPLS.
Why it's wrong here
If the threshold is too low, SLA might show dead, but it shows 'alive', so threshold is fine.
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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.