ANS-C01 Network Design Practice Question
A company is designing a multi-region active-active application using Amazon Route 53 and Application Load Balancers (ALBs). The application must be highly available and route traffic to the closest healthy endpoint. Which TWO configurations should the company use? (Choose two.)
⚠ Common exam trap
A common mix-up: candidates confuse latency-based routing with geoproximity routing, assuming geoproximity uses IP geolocation for closest endpoint routing, but latency-based routing is the correct service for dynamic proximity based on actual network performance, not static geographic boundaries.
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 with latency-based routing
Latency-based routing (Option B) directs traffic to the AWS region that provides the lowest latency for each user, which aligns with the requirement to route to the closest healthy endpoint. Health checks (Option C) must be associated with each Route 53 record to mark endpoints as healthy or unhealthy, ensuring traffic is only sent to available ALBs. Together, these configurations enable an active-active multi-region design with automatic failover to the next-lowest-latency healthy region.
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 Route 53 with failover routing
Why it's wrong here
Failover routing is active-passive, not suitable for active-active.
- ✓
Configure Route 53 with latency-based routing
Why this is correct
Latency-based routing sends traffic to the region with the lowest latency, supporting active-active and health checks.
- ✓
Associate health checks with each Route 53 record
Why this is correct
Health checks enable Route 53 to stop routing traffic to unhealthy endpoints, ensuring high availability.
- ✗
Configure Route 53 with weighted routing
Why it's wrong here
Weighted routing distributes traffic by weight but doesn't consider health for failover in an active-active design.
- ✗
Configure Route 53 with geoproximity routing
Why it's wrong here
Geoproximity routing biases traffic based on location, not latency, and doesn't inherently support active-active.
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