ANS-C01 Latency-based routing Practice Question
A company is designing a network architecture for a critical application that must be highly available across AWS Regions. The application uses an Application Load Balancer (ALB) in each Region, and the company wants to use a global DNS name that automatically routes traffic to the healthy Region with the lowest latency. The company also needs to be able to perform planned failover for maintenance. Which THREE components are required to meet these requirements?
⚠ Common exam trap
The ANS-C01 exam often tests the misconception that you can combine multiple routing policies (like latency and weighted) on the same Route 53 record set, but in reality, you cannot. The correct architecture uses latency-based routing with health checks for automatic failover, and a separate weighted routing policy (or a routing policy change) for planned failover.
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
✓
Amazon Route 53 weighted routing policy for each ALB endpoint
The correct components are a latency-based routing policy to automatically route to the lowest latency healthy region, health checks to determine endpoint health, and a weighted routing policy to enable planned failover by adjusting weights. While latency and weighted routing policies cannot be used simultaneously on the same record set, the question tests the knowledge of the required policies: latency for automatic routing, health checks for failover, and weighted for manual traffic shifting during maintenance. In practice, you would implement latency-based routing with health checks, and for planned maintenance, you would temporarily change the routing policy to weighted or use a separate record.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon Route 53 geolocation routing policy
Why it's wrong here
Geolocation is for location-based routing, not latency.
- ✗
Amazon Route 53 failover routing policy
Why it's wrong here
Failover routing is for primary/secondary, not latency-based.
- ✓
Amazon Route 53 weighted routing policy for each ALB endpoint
Why this is correct
Weighted records allow manual traffic shifting for maintenance.
- ✓
Amazon Route 53 latency-based routing policy
Why this is correct
Latency routing sends traffic to the lowest-latency healthy Region.
- ✓
Amazon Route 53 health checks for each ALB endpoint
Why this is correct
Health checks automatically remove unhealthy Regions.
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Same concept, more angles
1 more way this is tested on ANS-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is designing a network architecture for a critical application that requires high availability across multiple AWS regions. The application uses an Application Load Balancer (ALB) in each region. Which TWO services can provide global routing and failover between the two ALBs?
medium- ✓ A.Amazon Route 53 with failover routing and health checks
- B.AWS WAF
- C.Network Load Balancer (NLB)
- D.Amazon CloudFront
- ✓ E.AWS Global Accelerator
Why A: Amazon Route 53 with failover routing policy and health checks can route traffic to the primary ALB and automatically fail over to the secondary ALB in another region when the primary health check fails. This provides global DNS-based routing and failover across regions, meeting the high-availability requirement.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.