SAP-C02 Design for New Solutions Practice Question
A company is designing a multi-region active-active application using Amazon Route 53 latency-based routing. The application runs on Amazon EC2 instances behind Application Load Balancers (ALBs) in two AWS Regions. The company needs to ensure that if one region becomes unavailable, traffic is automatically routed to the healthy region with minimal disruption. Which configuration meets these requirements?
⚠ Common exam trap
Watch out — candidates often assume failover routing is the only way to handle regional failures, but for active-active architectures, latency-based routing with health checks provides automatic failover while maintaining low-latency routing to both regions.
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 Route 53 latency-based routing with health checks attached to each ALB endpoint.
Route 53 latency-based routing with health checks ensures that traffic is directed to the region with the lowest latency, and if an ALB endpoint fails its health check, Route 53 automatically removes it from DNS responses, routing traffic to the healthy region. This provides the required active-active multi-region failover with minimal disruption.
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 failover routing instead of latency-based routing.
Why it's wrong here
Failover routing is for active-passive, not active-active.
- ✗
Configure Route 53 latency-based routing without health checks.
Why it's wrong here
Without health checks, Route 53 will still send traffic to unhealthy endpoints.
- ✗
Use Route 53 weighted routing with weights set to 50 for each region.
Why it's wrong here
Weighted routing does not automatically failover based on health.
- ✓
Configure Route 53 latency-based routing with health checks attached to each ALB endpoint.
Why this is correct
Health checks allow Route 53 to automatically route traffic away from unhealthy endpoints.
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