NSE7 Advanced Networking and SD-WAN Practice Question
An administrator is configuring SD-WAN with two members: MPLS and Broadband. The requirement is that voice traffic (UDP ports 16384-32768) should use MPLS primarily, and if MPLS fails SLA, then use Broadband. Which two configurations are needed? (Choose TWO.)
⚠ Common exam trap
Many candidates confuse SD-WAN rules with policy-based routing or assume that disabling a member is needed to force traffic to MPLS, but SD-WAN rules with SLA monitoring are the correct mechanism for primary/backup failover without manual intervention.
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 a performance SLA for the MPLS member
A performance SLA must be configured on the MPLS member to monitor its link quality (e.g., latency, jitter, packet loss). If the SLA fails, the SD-WAN rule can then trigger a failover to the Broadband member. Option C is correct because an SD-WAN rule matching voice traffic with the 'best quality' strategy ensures that the traffic uses the highest-quality link (MPLS) as long as its SLA is met, automatically switching to Broadband when MPLS fails SLA.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable the Broadband member from the SD-WAN zone
Why it's wrong here
Need Broadband as fallback.
- ✓
Configure a performance SLA for the MPLS member
Why this is correct
Required to monitor link quality.
- ✓
Create an SD-WAN rule that matches voice traffic and uses 'best quality' strategy
Why this is correct
Matches traffic and uses SLA to select best member.
- ✗
Configure policy-based routing for voice traffic
Why it's wrong here
SD-WAN rules are the correct method.
- ✗
Set the load balancing algorithm to 'sessions'
Why it's wrong here
Not relevant to voice traffic steering.
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