The answer is that the instance lacks the required 'Environment' tag with value 'production'. This is because the IAM policy’s first statement uses a Condition block that restricts ec2:StartInstances and ec2:StopInstances to resources tagged Environment:production, and since these are resource-level actions, the condition is evaluated against the target instance. If the tag is missing or mismatched, the action is implicitly denied, even though the pipeline role has the correct permissions. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this tests your understanding of how tag-based conditions enforce resource-level access control, a common trap where engineers assume broad permissions override missing tags. Remember: for EC2 start/stop actions, the IAM policy tag condition must match the instance’s tags exactly, or the operation fails silently. A quick memory tip: “Tag or stop—no tag, no stop.”
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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.
A DevOps engineer created this IAM policy for a CI/CD pipeline role. The pipeline needs to stop and start production EC2 instances and manage Auto Scaling groups. However, the pipeline fails when trying to stop an instance. What is the most likely reason?
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.
The policy does not allow ec2:DescribeInstances for all instances.
Why wrong: ec2:DescribeInstances is allowed on all resources with a condition that is not evaluated? Actually, DescribeInstances is a list/read action that does not support resource-level conditions; the condition is ignored for read actions, so it's allowed.
B
The policy does not allow autoscaling:UpdateAutoScalingGroup for instances.
Why wrong: The second statement allows Auto Scaling actions on all resources.
C
The instance does not have the tag 'Environment' with value 'production'.
The condition restricts StartInstances and StopInstances to instances with that tag. Without the tag, the action is denied.
D
The ec2:StopInstances action requires an additional ec2:DescribeInstanceStatus permission.
Why wrong: No additional permission is required for stop; the issue is the condition.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The instance does not have the tag 'Environment' with value 'production'.
Option B is correct because the ec2:StartInstances and ec2:StopInstances actions are resource-level actions, but the Condition in the first statement requires the resource tag to be 'Environment':'production'. If the instance does not have that tag, the action is denied. The second statement allows Auto Scaling actions without conditions. Option A (ec2:DescribeInstances) is allowed. Option C (Auto Scaling actions) are allowed. Option D (stop operations require stop permission) is not accurate because the permission exists but is conditional.
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 policy does not allow ec2:DescribeInstances for all instances.
Why it's wrong here
ec2:DescribeInstances is allowed on all resources with a condition that is not evaluated? Actually, DescribeInstances is a list/read action that does not support resource-level conditions; the condition is ignored for read actions, so it's allowed.
✗
The policy does not allow autoscaling:UpdateAutoScalingGroup for instances.
Why it's wrong here
The second statement allows Auto Scaling actions on all resources.
✓
The instance does not have the tag 'Environment' with value 'production'.
Why this is correct
The condition restricts StartInstances and StopInstances to instances with that tag. Without the tag, the action is denied.
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 ec2:StopInstances action requires an additional ec2:DescribeInstanceStatus permission.
Why it's wrong here
No additional permission is required for stop; the issue is the condition.
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 DOP-C02 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.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The instance does not have the tag 'Environment' with value 'production'. — Option B is correct because the ec2:StartInstances and ec2:StopInstances actions are resource-level actions, but the Condition in the first statement requires the resource tag to be 'Environment':'production'. If the instance does not have that tag, the action is denied. The second statement allows Auto Scaling actions without conditions. Option A (ec2:DescribeInstances) is allowed. Option C (Auto Scaling actions) are allowed. Option D (stop operations require stop permission) is not accurate because the permission exists but is conditional.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 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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