- A
Auto Scaling group
Correct. An Auto Scaling group can launch instances across multiple Availability Zones and maintain a desired instance count, ensuring the application remains available even if one AZ fails.
- B
NAT Gateway
Why wrong: Incorrect. A NAT Gateway provides outbound internet access for instances in private subnets; it does not directly contribute to high availability of the application tiers.
- C
Amazon S3 bucket
Why wrong: Incorrect. An S3 bucket is for object storage, not for compute resources. It does not help with high availability of the web or application tier.
- D
Amazon Route 53 hosted zone
Why wrong: Incorrect. A Route 53 hosted zone manages DNS records and can be used for routing traffic, but the primary resources for high availability across AZs are the Auto Scaling group and Application Load Balancer. While Route 53 can support DNS-level failover, it is not a direct infrastructure resource within the CloudFormation template for this purpose.
- E
Application Load Balancer
Correct. An Application Load Balancer distributes traffic across targets in multiple Availability Zones, working with the Auto Scaling group to provide high availability and fault tolerance.
SOA-C02 Auto Scaling group Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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. A key principle to apply: auto Scaling group. 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 SysOps Administrator needs to automate the deployment of a three-tier web application on AWS. The application consists of a web tier, application tier, and database tier. The administrator wants to use AWS CloudFormation to provision the infrastructure. Which TWO resources should be included in the CloudFormation template to ensure the application is highly available across multiple Availability Zones?
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
Auto Scaling group
Options A and E are correct. An Auto Scaling group maintains a desired number of instances across multiple Availability Zones, ensuring resilience and high availability. An Application Load Balancer (ALB) distributes incoming traffic across those instances, further supporting high availability and fault tolerance. Option B (NAT Gateway) is used for outbound internet access from private subnets, not for high availability of the application. Option C (S3 bucket) is a storage service and does not directly impact compute high availability. Option D (Route 53 hosted zone) provides DNS routing but is not a primary resource for ensuring high availability within the application tiers; Route 53 can be used for DNS-level failover, but the question asks for resources directly in the CloudFormation template to ensure high availability across AZs, and the ALB and Auto Scaling group are the core components.
Key principle: Auto Scaling group
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Auto Scaling group
Why this is correct
Correct. An Auto Scaling group can launch instances across multiple Availability Zones and maintain a desired instance count, ensuring the application remains available even if one AZ fails.
Related concept
Auto Scaling group
- ✗
NAT Gateway
- ✗
Amazon S3 bucket
Why it's wrong here
Incorrect. An S3 bucket is for object storage, not for compute resources. It does not help with high availability of the web or application tier.
- ✗
Amazon Route 53 hosted zone
Why it's wrong here
Incorrect. A Route 53 hosted zone manages DNS records and can be used for routing traffic, but the primary resources for high availability across AZs are the Auto Scaling group and Application Load Balancer. While Route 53 can support DNS-level failover, it is not a direct infrastructure resource within the CloudFormation template for this purpose.
- ✓
Application Load Balancer
Why this is correct
Correct. An Application Load Balancer distributes traffic across targets in multiple Availability Zones, working with the Auto Scaling group to provide high availability and fault tolerance.
Related concept
Auto Scaling group
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Auto Scaling group
- Application Load Balancer
- High Availability across Availability Zones
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
Auto Scaling group
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Review auto Scaling group, then practise related SOA-C02 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Auto Scaling group.
What is the correct answer to this question?
The correct answer is: Auto Scaling group — Options A and E are correct. An Auto Scaling group maintains a desired number of instances across multiple Availability Zones, ensuring resilience and high availability. An Application Load Balancer (ALB) distributes incoming traffic across those instances, further supporting high availability and fault tolerance. Option B (NAT Gateway) is used for outbound internet access from private subnets, not for high availability of the application. Option C (S3 bucket) is a storage service and does not directly impact compute high availability. Option D (Route 53 hosted zone) provides DNS routing but is not a primary resource for ensuring high availability within the application tiers; Route 53 can be used for DNS-level failover, but the question asks for resources directly in the CloudFormation template to ensure high availability across AZs, and the ALB and Auto Scaling group are the core components.
What should I do if I get this SOA-C02 question wrong?
Review auto Scaling group, then practise related SOA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Auto Scaling group
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Last reviewed: Jun 20, 2026
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