- A
Deploy in two Regions with API Gateway, Lambda, and DynamoDB global tables. Use Route 53 failover routing with health checks.
Active-passive failover across regions provides highest availability.
- B
Deploy API Gateway, Lambda, and DynamoDB in a single Region with multi-AZ.
Why wrong: Multi-AZ provides availability within a region but not against regional failure.
- C
Deploy API Gateway in two Regions behind a Global Accelerator accelerator.
Why wrong: Global Accelerator supports ALB, NLB, and EC2, not API Gateway directly.
- D
Use a single API Gateway with CloudFront distribution in front, and Lambda@Edge for compute.
Why wrong: CloudFront with Lambda@Edge does not replicate the entire backend.
Question 146 of 1,705
Building a Resilient Serverless Application Across Regions
This ANS-C01 practice question tests your understanding of network design. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is building a serverless application using API Gateway, Lambda, and DynamoDB. The API must be accessible from the internet and be resilient to Regional failures. Which design provides the HIGHEST availability?
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
✓
Deploy in two Regions with API Gateway, Lambda, and DynamoDB global tables. Use Route 53 failover routing with health checks.
Option A is correct because it combines multi-Region deployment with Route 53 failover routing and health checks, ensuring that if one Region becomes unavailable, traffic is automatically redirected to the healthy Region. API Gateway, Lambda, and DynamoDB global tables provide the necessary cross-Region replication and stateless compute to maintain full functionality during a Regional outage, offering the highest availability.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Deploy in two Regions with API Gateway, Lambda, and DynamoDB global tables. Use Route 53 failover routing with health checks.
Why this is correct
Active-passive failover across regions provides highest availability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deploy API Gateway, Lambda, and DynamoDB in a single Region with multi-AZ.
Why it's wrong here
Multi-AZ provides availability within a region but not against regional failure.
- ✗
Deploy API Gateway in two Regions behind a Global Accelerator accelerator.
Why it's wrong here
Global Accelerator supports ALB, NLB, and EC2, not API Gateway directly.
- ✗
Use a single API Gateway with CloudFront distribution in front, and Lambda@Edge for compute.
Why it's wrong here
CloudFront with Lambda@Edge does not replicate the entire backend.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The ANS-C01 exam often tests the misconception that multi-AZ within a single Region is sufficient for Regional disaster recovery, but the trap here is that multi-AZ only protects against Availability Zone failures, not complete Regional outages.
Detailed technical explanation
How to think about this question
Route 53 failover routing uses DNS-based health checks to monitor the health of each Regional endpoint; when a health check fails, Route 53 automatically updates DNS records to point to the healthy Region, with a TTL typically set low (e.g., 60 seconds) to minimize failover time. DynamoDB global tables provide multi-Region, multi-active replication with eventual consistency, ensuring data is available in the secondary Region without manual intervention. API Gateway and Lambda are stateless services, so deploying them in multiple Regions with identical configurations allows seamless failover without session affinity issues.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy in two Regions with API Gateway, Lambda, and DynamoDB global tables. Use Route 53 failover routing with health checks. — Option A is correct because it combines multi-Region deployment with Route 53 failover routing and health checks, ensuring that if one Region becomes unavailable, traffic is automatically redirected to the healthy Region. API Gateway, Lambda, and DynamoDB global tables provide the necessary cross-Region replication and stateless compute to maintain full functionality during a Regional outage, offering the highest availability.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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.
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