NSE7 Advanced Networking and SD-WAN Practice Question
An organization is deploying SD-WAN across multiple sites with two internet links (MPLS and broadband) at the main branch. They want voice traffic to use the MPLS link unless it fails, in which case failover to broadband should occur. Which SD-WAN rule configuration achieves this?
⚠ Common exam trap
Watch out — candidates often confuse 'best quality' with 'lowest cost' or 'maximize bandwidth', not realizing that 'best quality' with a preferred member provides the exact active/passive failover behavior required for voice traffic.
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 an SD-WAN rule for voice with strategy 'best quality', set MPLS as preferred member, and define SLA targets for MPLS.
The 'best quality' strategy with a preferred member and SLA targets allows voice traffic to use the MPLS link as long as it meets the defined SLA (e.g., latency, jitter, packet loss). If the MPLS link fails or degrades below the SLA threshold, the SD-WAN rule automatically fails over to the broadband link, ensuring voice traffic continuity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure an SD-WAN rule for voice with strategy 'maximize bandwidth' and members MPLS and broadband.
Why it's wrong here
Maximize bandwidth spreads traffic, not failover.
- ✗
Configure an SD-WAN rule for voice with strategy 'lowest cost' and members MPLS and broadband.
Why it's wrong here
Lowest cost may route voice to broadband if cheaper, not preferred.
- ✓
Configure an SD-WAN rule for voice with strategy 'best quality', set MPLS as preferred member, and define SLA targets for MPLS.
Why this is correct
Best quality with preferred member and SLA ensures MPLS used unless SLA fails.
- ✗
Configure an SD-WAN rule for voice with strategy 'manual' and members MPLS and broadband.
Why it's wrong here
Manual strategy requires manual link selection.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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