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.
Network Topology
A CloudFormation stack update failed with the error shown. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Network Topology
A
The instance type t2.micro is not available in the region.
Why wrong: The error specifically mentions imageId, not instanceType.
B
The IAM role used by CloudFormation lacks ec2:RunInstances permissions.
Why wrong: The error is about invalid AMI ID, not permissions.
C
The AMI ID specified in the template is incorrect or has been deregistered.
The error clearly states the imageId is invalid.
D
The stack name does not match the existing stack.
Why wrong: The stack name is correct; the update failed on a resource.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The AMI ID specified in the template is incorrect or has been deregistered.
Option C is correct because the error message indicates that CloudFormation cannot find the specified AMI. This typically occurs when the AMI ID is incorrect, has been deregistered, or is not available in the region where the stack is being deployed. CloudFormation validates the AMI ID during stack creation or update, and if the AMI does not exist or is inaccessible, the operation fails with a 'Resource creation cancelled' error.
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.
✗
The instance type t2.micro is not available in the region.
Why it's wrong here
The error specifically mentions imageId, not instanceType.
✗
The IAM role used by CloudFormation lacks ec2:RunInstances permissions.
Why it's wrong here
The error is about invalid AMI ID, not permissions.
✓
The AMI ID specified in the template is incorrect or has been deregistered.
Why this is correct
The error clearly states the imageId is invalid.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The stack name does not match the existing stack.
Why it's wrong here
The stack name is correct; the update failed on a resource.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse a missing AMI error with an IAM permissions error, but the specific error message about 'AMI' not being found directly points to the AMI ID being invalid or unavailable, not to a lack of permissions.
Detailed technical explanation
How to think about this question
CloudFormation uses the AMI ID specified in the template to launch EC2 instances. If the AMI has been deregistered, is owned by another account without sharing permissions, or is region-specific (e.g., an AMI from us-east-1 used in eu-west-2), the EC2 API returns an error that CloudFormation surfaces as a resource creation failure. This is a common issue when templates hardcode AMI IDs instead of using Systems Manager Parameter Store or AWS::EC2::Image::Id dynamic references, which automatically resolve to the latest AMI in the region.
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.
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.
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: The AMI ID specified in the template is incorrect or has been deregistered. — Option C is correct because the error message indicates that CloudFormation cannot find the specified AMI. This typically occurs when the AMI ID is incorrect, has been deregistered, or is not available in the region where the stack is being deployed. CloudFormation validates the AMI ID during stack creation or update, and if the AMI does not exist or is inaccessible, the operation fails with a 'Resource creation cancelled' error.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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