- A
Add an Availability Zone parameter and map it to an AZ that supports the instance type, or use the AWS::EC2::Instance AvailabilityZone property to specify an AZ that supports the instance type.
Explicitly specifying a supported AZ resolves the incompatibility.
- B
Use AWS OpsWorks to deploy the instance instead of CloudFormation.
Why wrong: OpsWorks does not solve the AZ compatibility issue; it's a different service.
- C
Change the instance type to a previous generation that is supported in all AZs.
Why wrong: This may not be acceptable and does not fix the root cause.
- D
Modify the template to specify a different region that supports the instance type.
Why wrong: Changing region may help but is not a direct solution; the issue is within the current region's AZ.
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 DevOps engineer is troubleshooting a CloudFormation stack creation failure. The stack includes an AWS::EC2::Instance with a UserData script. The stack creation fails with the error: 'The following resource(s) failed to create: [EC2Instance]. The requested configuration is currently not supported. Please check the documentation for supported configurations.' The engineer suspects the instance type is not supported in the selected Availability Zone. Which action should the engineer take to resolve this issue and ensure successful stack creation?
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
Add an Availability Zone parameter and map it to an AZ that supports the instance type, or use the AWS::EC2::Instance AvailabilityZone property to specify an AZ that supports the instance type.
Option A is correct because the error indicates the instance type is not supported in the default Availability Zone (AZ) selected by CloudFormation. By explicitly specifying an AZ that supports the instance type via the `AvailabilityZone` property or by parameterizing the AZ, the engineer can override the default AZ selection and resolve the incompatibility. This approach directly addresses the root cause without changing the instance type or region.
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.
- ✓
Add an Availability Zone parameter and map it to an AZ that supports the instance type, or use the AWS::EC2::Instance AvailabilityZone property to specify an AZ that supports the instance type.
Why this is correct
Explicitly specifying a supported AZ resolves the incompatibility.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS OpsWorks to deploy the instance instead of CloudFormation.
Why it's wrong here
OpsWorks does not solve the AZ compatibility issue; it's a different service.
- ✗
Change the instance type to a previous generation that is supported in all AZs.
Why it's wrong here
This may not be acceptable and does not fix the root cause.
- ✗
Modify the template to specify a different region that supports the instance type.
Why it's wrong here
Changing region may help but is not a direct solution; the issue is within the current region's AZ.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume the instance type itself is unsupported in the entire region and choose to change the region or instance type, rather than recognizing that the error is AZ-specific and can be resolved by explicitly specifying a supported Availability Zone.
Detailed technical explanation
How to think about this question
CloudFormation selects a default AZ for an `AWS::EC2::Instance` resource if no `AvailabilityZone` property is specified, and this default AZ may not support newer instance types (e.g., `t3` or `m5` families) in all AZs. The `Fn::GetAZs` intrinsic function or a parameterized AZ list can be used to dynamically select a supported AZ, ensuring the stack creation succeeds without hardcoding values. This is a common scenario when using instance types that are gradually rolled out across AZs.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add an Availability Zone parameter and map it to an AZ that supports the instance type, or use the AWS::EC2::Instance AvailabilityZone property to specify an AZ that supports the instance type. — Option A is correct because the error indicates the instance type is not supported in the default Availability Zone (AZ) selected by CloudFormation. By explicitly specifying an AZ that supports the instance type via the `AvailabilityZone` property or by parameterizing the AZ, the engineer can override the default AZ selection and resolve the incompatibility. This approach directly addresses the root cause without changing the instance type or region.
What should I do if I get this DOP-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.
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Last reviewed: Jul 4, 2026
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