DOP-C02 CloudFormation change set pipeline Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 uses AWS CloudFormation to manage infrastructure. They need to implement a CI/CD pipeline that automatically updates CloudFormation stacks when changes are pushed to a CodeCommit repository. The pipeline must use change sets to review changes before execution. Which pipeline configuration meets these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a CloudFormation action with action mode 'CHANGE_SET_REPLACEMENT' and then a separate action with mode 'CHANGE_SET_EXECUTE' after an approval step.
Option B is correct because CodePipeline's CloudFormation deployment action supports a 'CHANGE_SET_REPLACEMENT' mode that creates or replaces a change set without executing it, followed by a 'CHANGE_SET_EXECUTE' action that applies the change set after an approval step. This two-step approach allows teams to review infrastructure changes before they are applied, meeting the requirement to use change sets for review before execution.
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 a CloudFormation action in CodePipeline with action mode 'CREATE_UPDATE' and include a manual approval step before the action.
Why it's wrong here
CREATE_UPDATE directly applies changes without creating a change set first.
✗
Use an AWS Lambda function to create a change set and trigger a manual approval via SNS.
Why it's wrong here
This is more complex and not the native CodePipeline CloudFormation action.
✗
Use a CloudFormation action with action mode 'CREATE_UPDATE' and set the 'Review' flag to true.
Why it's wrong here
There is no 'Review' flag; CloudFormation actions do not support reviewing before update in that mode.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The DOP-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use a CloudFormation action with action mode 'CHANGE_SET_REPLACEMENT' and then a separate action with mode 'CHANGE_SET_EXECUTE' after an approval step.Correct answer▾✗Use a CloudFormation action in CodePipeline with action mode 'CREATE_UPDATE' and include a manual approval step before the action.Wrong answer — click to see why▾
Why this is wrong here
CREATE_UPDATE directly applies changes without creating a change set first.
✗Use an AWS Lambda function to create a change set and trigger a manual approval via SNS.Wrong answer — click to see why▾
Why this is wrong here
This is more complex and not the native CodePipeline CloudFormation action.
✗Use a CloudFormation action with action mode 'CREATE_UPDATE' and set the 'Review' flag to true.Wrong answer — click to see why▾
Why this is wrong here
There is no 'Review' flag; CloudFormation actions do not support reviewing before update in that mode.
Analysis generated from the official DOP-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a manual approval step combined with a 'CREATE_UPDATE' action is sufficient for review, but they miss that change sets are required to preview the actual changes before execution, and 'CREATE_UPDATE' does not generate a change set at all.
Detailed technical explanation
How to think about this question
Under the hood, the 'CHANGE_SET_REPLACEMENT' mode in CodePipeline's CloudFormation action uses the AWS CloudFormation CreateChangeSet API to generate a change set that captures the difference between the current stack template and the proposed template. The subsequent 'CHANGE_SET_EXECUTE' action calls the ExecuteChangeSet API, which applies the changes only after the approval gate is passed. This pattern is critical in production environments where unintended modifications to infrastructure (e.g., accidental deletion of a database) must be caught through human review, and it ensures that the pipeline remains idempotent and auditable.
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.
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.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a CloudFormation action with action mode 'CHANGE_SET_REPLACEMENT' and then a separate action with mode 'CHANGE_SET_EXECUTE' after an approval step. — Option B is correct because CodePipeline's CloudFormation deployment action supports a 'CHANGE_SET_REPLACEMENT' mode that creates or replaces a change set without executing it, followed by a 'CHANGE_SET_EXECUTE' action that applies the change set after an approval step. This two-step approach allows teams to review infrastructure changes before they are applied, meeting the requirement to use change sets for review before execution.
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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Question Discussion
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