SAP-C02 Design for New Solutions Practice Question
A company wants to design a highly available, stateless web application using Amazon ECS with Fargate. They need to distribute traffic across multiple AWS Regions for low latency. Which approach should they use?
⚠ Common exam trap
Candidates often confuse AWS Global Accelerator with Route 53 latency-based routing, assuming Global Accelerator is always better for multi-region latency, but the question specifically asks for a stateless web application using ECS Fargate, where an ALB is the natural fit and Route 53 latency-based routing provides the simplest and most cost-effective solution for HTTP/HTTPS traffic distribution across 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
✓
Use Amazon Route 53 latency-based routing to direct traffic to an Application Load Balancer in each region.
Amazon Route 53 latency-based routing directs users to the region with the lowest latency, and using an Application Load Balancer (ALB) in each region provides regional traffic distribution and health checks for the stateless ECS Fargate tasks. This combination ensures high availability and low latency across multiple AWS Regions, as the ALB handles HTTP/HTTPS traffic and integrates with ECS service discovery.
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 a single Network Load Balancer in the primary region with cross-zone load balancing.
Why it's wrong here
Single region does not provide multi-region distribution.
- ✓
Use Amazon Route 53 latency-based routing to direct traffic to an Application Load Balancer in each region.
Why this is correct
Latency routing and ALB are appropriate for stateless web apps.
- ✗
Use Amazon CloudFront with origins in each region.
Why it's wrong here
CloudFront is for static content caching.
- ✗
Use AWS Global Accelerator with Network Load Balancers in each region.
Why it's wrong here
AWS Global Accelerator, while improving performance and availability by routing traffic over the AWS global network to the nearest healthy endpoint, operates at Layer 4 (TCP/UDP). For a web application, which typically uses HTTP/HTTPS (Layer 7), this approach lacks the granular, application-level routing intelligence required for optimising traffic based on HTTP headers or path. This option is tempting because Global Accelerator does provide static IP addresses and enhances network performance across regions, making it ideal for non-HTTP/HTTPS applications or scenarios where only network-level failover and routing are needed.
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