This DOP-C02 practice question tests your understanding of sdlc automation. 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.
Refer to the exhibit. A DevOps engineer ran the above AWS CLI command after a CloudFormation stack update. What does the status 'ROLLBACK_COMPLETE' indicate?
The stack update is in progress.
Why wrong: In-progress status would be UPDATE_IN_PROGRESS.
The stack was deleted successfully.
Why wrong: Delete status would be DELETE_COMPLETE.
The stack was created successfully.
Why wrong: ROLLBACK is not a success status.
The stack update failed and CloudFormation reverted to the previous stack.
ROLLBACK_COMPLETE indicates a failed update with rollback.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The stack update failed and CloudFormation reverted to the previous stack.
The 'ROLLBACK_COMPLETE' status indicates that the CloudFormation stack update operation failed, and CloudFormation automatically reverted the stack to its previous stable state. This is a built-in safety mechanism: if any resource fails to update, CloudFormation triggers a rollback to undo all changes made during the update, ensuring the stack returns to its last known good configuration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The stack update is in progress.
Why it's wrong here
In-progress status would be UPDATE_IN_PROGRESS.
The stack was deleted successfully.
Why it's wrong here
Delete status would be DELETE_COMPLETE.
The stack was created successfully.
Why it's wrong here
ROLLBACK is not a success status.
The stack update failed and CloudFormation reverted to the previous stack.
Why this is correct
ROLLBACK_COMPLETE indicates a failed update with rollback.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse 'ROLLBACK_COMPLETE' with a successful operation or a deletion, when in fact it specifically means the update failed and the stack was reverted to its prior state.
Detailed technical explanation
Under the hood, CloudFormation tracks stack operations using a change set and resource statuses. When an update fails, CloudFormation automatically initiates a rollback by reversing the change set — it re-applies the previous template and parameters, and for each resource, it either updates back to the old configuration or re-creates it from the old state. A real-world scenario: if an update to an EC2 instance's security group fails due to an invalid rule, CloudFormation will roll back the entire stack, including any other resources that were successfully updated, to maintain consistency.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
The correct answer is: The stack update failed and CloudFormation reverted to the previous stack. — The 'ROLLBACK_COMPLETE' status indicates that the CloudFormation stack update operation failed, and CloudFormation automatically reverted the stack to its previous stable state. This is a built-in safety mechanism: if any resource fails to update, CloudFormation triggers a rollback to undo all changes made during the update, ensuring the stack returns to its last known good configuration.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.
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