ANS-C01 Network Design Practice Question
A company is designing a multi-region application with an Application Load Balancer (ALB) in us-east-1 and us-west-2. They want to route traffic to the nearest region using latency-based routing. Which AWS service should they use to achieve this?
⚠ Common exam trap
Many exam-takers confuse AWS Global Accelerator's Anycast routing with DNS-based latency routing, but Global Accelerator optimizes network path performance for TCP/UDP traffic at the transport layer, not DNS-level latency-based routing for ALB endpoints.
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 with latency routing policy
Route 53's latency routing policy directs traffic to the region with the lowest network latency for the end user, based on measurements between AWS regions and the client's DNS resolver. This directly meets the requirement to route traffic to the nearest region without adding any additional infrastructure or cost beyond DNS queries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Global Accelerator
Why it's wrong here
Global Accelerator uses anycast IPs to route to the nearest endpoint, but it does not provide latency-based routing policies like Route 53.
- ✗
AWS Transit Gateway
Why it's wrong here
Transit Gateway is used for network connectivity between VPCs, not for DNS-based routing.
- ✗
Amazon CloudFront with multiple origins
Why it's wrong here
CloudFront is a content delivery network, not designed for latency-based routing to ALBs in a multi-region active-active setup.
- ✓
Amazon Route 53 with latency routing policy
Why this is correct
Amazon Route 53’s latency routing policy directs traffic to the region with the lowest network latency for each user, satisfying the requirement to route to the nearest region in a multi-region ALB deployment. This policy uses latency measurements between AWS regions and the client’s DNS resolver, not geographic distance, to select the optimal endpoint.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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