Question 57 of 1,511
Achieving Multi-Region Resilience for Lambda, API Gateway, and DynamoDB
A company is deploying a serverless application using AWS Lambda, Amazon API Gateway, and Amazon DynamoDB. The application must be resilient to regional outages. Which THREE steps should the company take to achieve multi-Region resilience? (Choose THREE.)
Quick Answer
The correct approach is to deploy a second API Gateway and Lambda function in another Region, use DynamoDB global tables for data replication, and configure Route 53 with a failover routing policy. This combination ensures that when a health check detects a primary Region failure, DNS traffic is automatically rerouted to the standby Region, while DynamoDB global tables provide active-active data replication so the secondary Lambda function can read and write the same data with eventual consistency. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of stateless application design and cross-Region failover patterns—a common trap is forgetting that Lambda and API Gateway are regional services, so you must explicitly deploy them in each Region rather than relying on a single endpoint. A key memory tip is “three R’s for resilience: Route 53, Replicated data, and Redundant compute.”
⚠ Common exam trap
It's easy for candidates to confuse CloudFront's origin failover capability (which requires manual configuration of origin groups) with automatic multi-Region failover, or they mistakenly believe Lambda@Edge can serve as a full application backend across Regions, when in fact it is limited to edge processing and cannot replace regional Lambda deployments.
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 a failover routing policy to direct traffic to the secondary Region if the primary fails.
Amazon Route 53 with a failover routing policy allows the company to route traffic to a secondary Region when health checks detect a failure in the primary Region. This provides DNS-level failover, which is a fundamental component of multi-Region resilience for HTTP-based applications.
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 Amazon CloudFront with multiple origins pointing to each Region's API Gateway.
Why it's wrong here
CloudFront is for content delivery, not for regional failover of API endpoints directly.
- ✓
Configure Route 53 with a failover routing policy to direct traffic to the secondary Region if the primary fails.
Why this is correct
Route 53 failover routing enables traffic redirection.
- ✓
Use DynamoDB global tables to replicate data across Regions.
Why this is correct
Global tables provide active-active replication for resilience.
- ✗
Deploy Lambda@Edge functions to handle requests at edge locations.
Why it's wrong here
Lambda@Edge runs at edge, not in a secondary Region.
- ✓
Deploy a second API Gateway and Lambda function in another Region.
Why this is correct
Deploying compute in a second Region provides redundancy.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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Same concept, more angles
1 more way this is tested on DOP-C02
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 serverless application using AWS Lambda, Amazon API Gateway, and Amazon DynamoDB. The application must tolerate a Regional failure. Which design provides the most resilience?
medium- A.Use Lambda@Edge to run functions at AWS edge locations
- B.Use DynamoDB auto-scaling and run Lambda in a single Region
- ✓ C.Use DynamoDB global tables with Lambda functions deployed in multiple Regions and Route 53 multi-Region routing
- D.Use DynamoDB Accelerator (DAX) to cache data across Regions
Why C: DynamoDB global tables provide multi-Region, fully replicated tables with automatic conflict resolution, ensuring data availability during a Regional outage. Deploying Lambda functions in multiple Regions with Route 53 multi-Region routing (using health checks and latency-based or weighted routing) allows traffic to fail over to a healthy Region, making the entire serverless stack resilient to a Regional failure.
Last reviewed: Jun 24, 2026
This DOP-C02 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 DOP-C02 exam.
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