ANS-C01 Network Design Practice Question
A company is deploying a multi-region Active-Active application using Amazon Route 53 latency-based routing. The application runs on EC2 instances behind Network Load Balancers (NLBs) in two AWS regions. The health checks are configured for the NLBs. What should the company do to ensure that traffic is sent only to healthy endpoints?
⚠ Common exam trap
Candidates often confuse latency-based routing with failover routing, assuming failover is required for health checks, but latency-based routing with health checks supports Active-Active while failover routing is strictly Active-Passive.
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
✓
Use Route 53 latency-based routing and associate health checks.
Route 53 latency-based routing directs traffic to the region with the lowest latency for the user. By associating health checks with the latency records, Route 53 automatically excludes any endpoint that fails its health check (e.g., an unhealthy NLB) from DNS responses, ensuring traffic is sent only to healthy endpoints. This meets the requirement for an Active-Active multi-region setup where both regions serve traffic simultaneously.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use Route 53 latency-based routing and associate health checks.
Why this is correct
Latency routing combined with health checks sends traffic only to healthy endpoints with the lowest latency.
- ✗
Use Route 53 geolocation routing and associate health checks.
Why it's wrong here
Geolocation routing does support health checks, but it routes traffic based on the geographic location of the user rather than latency. This does not meet the requirement for a latency-based active-active setup, as it may not direct users to the lowest-latency region and can send traffic to an unhealthy region if the health check fails.
- ✗
Use Route 53 weighted routing and associate health checks.
Why it's wrong here
Weighted routing distributes traffic by weight, not latency.
- ✗
Use Route 53 failover routing with primary and secondary records.
Why it's wrong here
Failover routing is for active-passive, not active-active.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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