- A
Use AWS Global Accelerator to route traffic to the closest Region.
Why wrong: Global Accelerator improves performance but does not automatically fail over to another Region if the primary is down.
- B
Configure Lambda functions with provisioned concurrency in multiple Regions.
Why wrong: Provisioned concurrency does not make Lambda multi-Region.
- C
Use Lambda@Edge to run the functions at edge locations.
Why wrong: Lambda@Edge runs at CloudFront edge locations, not Regions, and is subject to regional dependencies.
- D
Deploy the same API Gateway and Lambda setup in a second Region and use Route 53 with failover routing.
Route 53 failover routing can redirect traffic to the secondary Region.
Question 969 of 1,546
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 runs a critical application on AWS Lambda functions. The functions are invoked by an API Gateway endpoint. The SysOps administrator needs to ensure that the application continues to work if an entire AWS Region becomes unavailable. What should the administrator do?
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 the same API Gateway and Lambda setup in a second Region and use Route 53 with failover routing.
Option D is correct because deploying the same API Gateway and Lambda setup in a second AWS Region and using Route 53 with failover routing creates an active-passive disaster recovery architecture. Route 53 health checks monitor the primary Region's endpoint, and if it becomes unhealthy (e.g., due to a regional outage), DNS failover automatically routes traffic to the secondary Region, ensuring continuous operation of the application.
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.
- ✗
Use AWS Global Accelerator to route traffic to the closest Region.
Why it's wrong here
Global Accelerator improves performance but does not automatically fail over to another Region if the primary is down.
- ✗
Configure Lambda functions with provisioned concurrency in multiple Regions.
Why it's wrong here
Provisioned concurrency does not make Lambda multi-Region.
- ✗
Use Lambda@Edge to run the functions at edge locations.
Why it's wrong here
Lambda@Edge runs at CloudFront edge locations, not Regions, and is subject to regional dependencies.
- ✓
Deploy the same API Gateway and Lambda setup in a second Region and use Route 53 with failover routing.
Why this is correct
Route 53 failover routing can redirect traffic to the secondary Region.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse high-availability features like Global Accelerator or provisioned concurrency with true disaster recovery across Regions, failing to recognize that only Route 53 failover routing provides the DNS-level traffic redirection needed when an entire Region becomes unavailable.
Detailed technical explanation
How to think about this question
Route 53 failover routing uses DNS-based health checks that evaluate the availability of the primary endpoint (e.g., an Application Load Balancer or API Gateway) by sending periodic HTTP/HTTPS requests. If the health check fails after a configurable threshold (default 3 consecutive failures), Route 53 automatically returns the IP address of the secondary Region's resources in DNS responses, with a TTL typically set low (e.g., 60 seconds) to minimize failover time. This approach requires the secondary Region to be fully provisioned and ready to handle traffic, including identical Lambda functions, API Gateway configurations, and any dependent services like DynamoDB global tables or RDS cross-Region replicas.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Reliability and Business Continuity — study guide chapter
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Reliability and Business Continuity practice questions
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Deploy the same API Gateway and Lambda setup in a second Region and use Route 53 with failover routing. — Option D is correct because deploying the same API Gateway and Lambda setup in a second AWS Region and using Route 53 with failover routing creates an active-passive disaster recovery architecture. Route 53 health checks monitor the primary Region's endpoint, and if it becomes unhealthy (e.g., due to a regional outage), DNS failover automatically routes traffic to the secondary Region, ensuring continuous operation of the application.
What should I do if I get this SOA-C02 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.
About these practice questions
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Last reviewed: Jul 4, 2026
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