ANS-C01 Network Design Practice Question
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?
⚠ Common exam trap
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.
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.
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.
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.
- ✗
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.
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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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.