The correct answer is that UPDATE_ROLLBACK_FAILED means the stack update failed and the subsequent rollback also failed. This occurs because CloudFormation attempts to revert a failed update to the last known good state, but if that rollback operation itself encounters an error—such as a resource that cannot be deleted, renamed, or restored—the stack becomes stuck in an inconsistent, partially updated state. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of CloudFormation stack lifecycle states, particularly for critical SAP deployments where rollback failures can leave production systems in a broken condition. A common trap is confusing this state with a simple update failure or a permissions issue; the key distinction is that the rollback itself must have failed. Memory tip: think of it as a “double fault”—the update fails, then the safety net (rollback) also fails, leaving the stack hanging.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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
Refer to the exhibit. A CloudFormation stack for an SAP deployment is in state UPDATE_ROLLBACK_FAILED. 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.
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 the subsequent rollback also failed
Option C is correct because UPDATE_ROLLBACK_FAILED indicates that the rollback of a failed update encountered an error, leaving the stack in an inconsistent state. Option A is incorrect because insufficient IAM permissions would cause a failure, not a rollback failure. Option B is incorrect because drift is detected, but drift does not cause rollback failure. Option D is incorrect because a deleted resource would cause a different 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 stack update was attempted without sufficient IAM permissions
Why it's wrong here
Permissions issues cause update failure, not rollback failure.
✗
The stack has drifted from the template configuration
Why it's wrong here
Drift is detected but does not cause rollback failure.
✓
The stack update failed and the subsequent rollback also failed
Why this is correct
UPDATE_ROLLBACK_FAILED means both update and rollback failed.
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.
✗
A resource in the stack was deleted outside of CloudFormation
Why it's wrong here
This would cause drift, not a rollback failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The stack update failed and the subsequent rollback also failed — Option C is correct because UPDATE_ROLLBACK_FAILED indicates that the rollback of a failed update encountered an error, leaving the stack in an inconsistent state. Option A is incorrect because insufficient IAM permissions would cause a failure, not a rollback failure. Option B is incorrect because drift is detected, but drift does not cause rollback failure. Option D is incorrect because a deleted resource would cause a different error.
What should I do if I get this PAS-C01 question wrong?
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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