DOP-C02 Resilient Cloud Solutions Practice Question
A company uses AWS CloudFormation to deploy a multi-tier application. During an update, the stack fails and rolls back. The rollback also fails, leaving the stack in UPDATE_ROLLBACK_FAILED state. The operations team needs to resolve this with minimal disruption. What is the MOST efficient approach?
⚠ Common exam trap
DOP-C02 often tests whether candidates know that ContinueUpdateRollback is the only supported way out of UPDATE_ROLLBACK_FAILED — deleting the stack or running a change set sounds reasonable but is either destructive or blocked.
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
✓
Use the 'ContinueUpdateRollback' API or AWS Management Console to retry the rollback.
When a CloudFormation stack is stuck in UPDATE_ROLLBACK_FAILED, the supported recovery path is to call ContinueUpdateRollback (via API, CLI, or console) to resume the rollback, optionally skipping specific resources that are blocking it. This preserves the stack and its resources with minimal disruption.
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 the 'ContinueUpdateRollback' API or AWS Management Console to retry the rollback.
Why this is correct
The Correct answer: The `ContinueUpdateRollback` API or the AWS Management Console action is specifically designed for stacks stuck in `UPDATE_ROLLBACK_FAILED`. It resumes the rollback from the point where it failed, skips resources that were already successfully rolled back, and can optionally skip resources you explicitly specify. This recovers the stack to its last known good state with minimal disruption, and it is the only built-in mechanism that directly resolves this status.
- ✗
Manually modify the resources to match the previous stack state.
Why it's wrong here
Wrong: Manually altering underlying resources to match the previous stack state does not update CloudFormation's internal record of the stack; it only creates drift between the live resources and the stack template. The stack remains in `UPDATE_ROLLBACK_FAILED` because the service did not complete its rollback workflow, and subsequent drift detection or stack operations may fail or behave unpredictably. Manual modifications are not automated, are error-prone, and can introduce inconsistencies that are worse than the original failure.
- ✗
Delete the stack and recreate it from the original template.
Why it's wrong here
Wrong: Deleting the stack and recreating it from the original template is unnecessarily destructive and risks cascading failures, especially for resources with dependencies or data that must be preserved. The `DELETE` operation may itself fail if the stack is in `UPDATE_ROLLBACK_FAILED` because some resources may be in an inconsistent or partially configured state. CloudFormation's `ContinueUpdateRollback` is the intended, safer, and less disruptive recovery path, so recreating from scratch is an overreaction and not a recommended practice.
- ✗
Execute a change set to update the stack to the desired configuration.
Why it's wrong here
Wrong: Executing a change set is invalid because CloudFormation only allows change sets to be created and executed on stacks in stable states, such as `UPDATE_COMPLETE` or `UPDATE_ROLLBACK_COMPLETE`. A stack in `UPDATE_ROLLBACK_FAILED` is in an unstable, mid-operation state, so any new change set creation or execution will be rejected. You must first resolve the rollback failure via `ContinueUpdateRollback` before you can apply any subsequent intended configuration changes.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
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.