NSE7 Advanced Networking and SD-WAN Practice Question
A FortiGate is configured with two WAN members in an SD-WAN zone. The performance SLA monitors latency to a probe server. The rule uses 'best quality' strategy. After some time, one member fails the SLA. Which action does the FortiGate take for existing sessions that were using that member?
⚠ Common exam trap
Candidates often assume SD-WAN 'best quality' strategy dynamically re-routes all traffic, including existing sessions, when an SLA fails, but FortiGate only applies path selection changes to new sessions to maintain session stability.
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
✓
Existing sessions continue on the failed member until they timeout
When a WAN member fails the performance SLA in an SD-WAN 'best quality' strategy, FortiGate does not disrupt existing sessions that were already using that member. Instead, those sessions continue on the failed member until they naturally timeout or are torn down, because the SD-WAN rule only influences the path selection for new sessions. This behavior is by design to avoid breaking active connections due to transient SLA fluctuations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All sessions are dropped and the member is removed from the zone
Why it's wrong here
Only new sessions redirect; existing not dropped.
- ✗
Existing sessions are re-evaluated and may be moved based on policy
Why it's wrong here
No re-evaluation of existing sessions.
- ✗
Existing sessions are immediately moved to another member
Why it's wrong here
FortiGate does not move existing sessions.
- ✓
Existing sessions continue on the failed member until they timeout
Why this is correct
Only new sessions are affected.
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