Q17 — AWS DOP-C02 Ch.3

Question 17 of 100 | ← Chapter 3

A company is implementing a Well-Architected design for a globally accessible API stack. The design must ensure high availability and low latency for customers in North America and Europe. The API stack consists of the following three layers: Amazon API Gateway AWS Lambda Amazon DynamoDB Which solution satisfies these requirements?

• A. Configure Amazon Route 53 with health checks to route traffic to API Gateway APIs in North America and Europe. Configure the APIs to forward requests to Lambda functions in the same region. Configure Lambda functions to retrieve and update data in DynamoDB tables located in the same region.
• B. Configure Amazon Route 53 with latency-based routing and health checks to route traffic to API Gateway APIs in North America and Europe. Configure the APIs to forward requests to Lambda functions in the same region. Configure Lambda functions to retrieve and update data in DynamoDB Global Tables. ✓
• C. Configure Amazon Route 53 to point to the North American API Gateway and create a disaster recovery API in Europe. Configure both APIs to forward requests to Lambda functions in their respective regions. Retrieve data from DynamoDB Global Tables. Deploy Lambda functions to check North American API health every 5 minutes and update Route 53 to point to the disaster recovery API if a failure occurs.
• D. Configure Amazon Route 53 with latency-based routing to point to the North American API Gateway API. Configure the API to forward requests to Lambda functions in the region closest to the user. Configure Lambda functions to retrieve and update data in DynamoDB tables.

Correct Answer: B. Configure Amazon Route 53 with latency-based routing and health checks to route traffic to API Gateway APIs in North America and Europe. Configure the APIs to forward requests to Lambda functions in the same region. Configure Lambda functions to retrieve and update data in DynamoDB Global Tables.

Explanation

Option B satisfies the requirements. Latency-based routing combined with health checks in Route 53 directs users to the geographically closer and healthy API Gateway endpoint—ensuring low latency for both North American and European users. Routing requests to region-local Lambda functions minimizes inter-regional latency. Using DynamoDB Global Tables guarantees strong consistency and high availability across regions, enabling seamless data access regardless of user location. Thus, Option B delivers optimal performance, resilience, and global scalability.