NSE7 Advanced Networking and SD-WAN Practice Question
An administrator is configuring SD-WAN rules to steer traffic based on application performance. The requirement is to use VoIP traffic over the WAN link that has the lowest latency, but if latency exceeds 100ms, fail over to a backup link. The administrator has already created performance SLAs for both links. Which THREE configuration steps are required?
⚠ Common exam trap
Many candidates confuse the 'failover-threshold' parameter on SD-WAN members with the SLA constraint in the SD-WAN rule, where the actual latency threshold for failover is defined.
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
✓
Configure the SLA metric to 'latency' in the performance SLA
The performance SLA must be configured to monitor latency as the metric to measure link quality. Without setting the SLA metric to 'latency', the SD-WAN rule cannot evaluate which link has the lowest latency for VoIP traffic, which is the core requirement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set the 'failover-threshold' on each SD-WAN member to 100
Why it's wrong here
The threshold is applied in the SLA, not on the member.
- ✗
Add both WAN interfaces to the rule as members and set weight based on latency
Why it's wrong here
Weight is not used in best quality method.
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