The correct answer is D because the IAM policy shown does not prevent stopping instances with the Development tag. The key technical distinction here is that the Deny statement explicitly targets ec2:TerminateInstances, not ec2:StopInstances, and applies only when the tag Environment is NOT Production. Since the user is attempting a stop action on a Development-tagged instance, the Allow statement for StopInstances on all resources remains in effect, meaning the failure must stem from another policy, a service control policy, or a resource-level constraint like an Auto Scaling group that prohibits manual stop actions. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your ability to parse IAM policy logic precisely—specifically, the difference between stop and terminate actions, and how Deny statements with conditions interact with broader Allow statements. A common trap is assuming a Deny on terminate also blocks stop, but AWS evaluates each action independently. Memory tip: “Stop is not terminate; a Deny on terminate leaves stop intact.”
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. 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 is troubleshooting an issue where an IAM user is unable to stop an EC2 instance with the tag 'Environment: Development'. The attached IAM policy is shown. Which statement explains the failure?
The Deny statement condition incorrectly uses StringNotEquals, which denies all instances except those with the Production tag.
Why wrong: The Deny denies TerminateInstances when the tag is NOT Production, meaning it allows termination of Production instances but denies termination of others. This does not affect stop.
B
The Deny statement includes ec2:StopInstances implicitly because stop is a termination action.
Why wrong: Stop is not a termination action; the Deny only applies to TerminateInstances.
C
The Allow statement only grants ec2:DescribeInstances, not start/stop.
Why wrong: The Allow statement includes StartInstances and StopInstances.
D
The policy does not prevent stopping instances with the Development tag; the failure must be caused by another policy or service control policy.
The policy allows StopInstances on all instances, so the inability to stop is due to another factor.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy does not prevent stopping instances with the Development tag; the failure must be caused by another policy or service control policy.
Option D is correct. The Deny statement denies ec2:TerminateInstances for instances where the tag Environment is NOT Production. However, the user is trying to stop an instance, not terminate it. The StopInstances action is allowed by the first statement. But wait, the user is unable to stop; that suggests there is an additional deny or the policy is not the issue. Actually, the policy allows StopInstances. The problem might be that the user is trying to stop an instance that is part of an Auto Scaling group and the stop action is not allowed by the ASG. But based on the policy alone, the user should be able to stop. However, the question says 'unable to stop'. Actually, the Deny statement only applies to TerminateInstances. So the correct answer is D: The policy does not restrict stop actions, so the issue is elsewhere. But the question asks 'Which statement explains the failure?' The options are about the policy. Let's review: Option A says the Deny statement prevents stop, which is false. Option B says the Allow statement only gives describe, but it gives start and stop. Option C says the condition on the Deny statement incorrectly uses StringNotEquals. Option D says the policy does not prevent stopping instances with Development tag. Actually, the user can stop Development instances because the Deny only applies to terminate. So the failure must be due to something else. However, the question expects D as correct because the policy is not the cause. But that doesn't 'explain the failure'. Hmm. I think the intended answer is D: The policy does not prevent stopping instances with the Development tag, so the failure is not due to this policy. But that doesn't explain why they can't stop. Maybe the exhibit is about a different issue. Let me re-read: 'unable to stop an EC2 instance with the tag Environment: Development'. The policy allows StopInstances on all resources. So why can't they stop? Possibly because there is another policy denying it. But the question is to explain based on the exhibit. The best answer is D because the policy shown does not deny stop. So the failure must be due to another reason. I'll go with D.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 Deny statement condition incorrectly uses StringNotEquals, which denies all instances except those with the Production tag.
Why it's wrong here
The Deny denies TerminateInstances when the tag is NOT Production, meaning it allows termination of Production instances but denies termination of others. This does not affect stop.
✗
The Deny statement includes ec2:StopInstances implicitly because stop is a termination action.
Why it's wrong here
Stop is not a termination action; the Deny only applies to TerminateInstances.
✗
The Allow statement only grants ec2:DescribeInstances, not start/stop.
Why it's wrong here
The Allow statement includes StartInstances and StopInstances.
✓
The policy does not prevent stopping instances with the Development tag; the failure must be caused by another policy or service control policy.
Why this is correct
The policy allows StopInstances on all instances, so the inability to stop is due to another factor.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
Configuration Management and IaC — This question tests Configuration Management and IaC — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The policy does not prevent stopping instances with the Development tag; the failure must be caused by another policy or service control policy. — Option D is correct. The Deny statement denies ec2:TerminateInstances for instances where the tag Environment is NOT Production. However, the user is trying to stop an instance, not terminate it. The StopInstances action is allowed by the first statement. But wait, the user is unable to stop; that suggests there is an additional deny or the policy is not the issue. Actually, the policy allows StopInstances. The problem might be that the user is trying to stop an instance that is part of an Auto Scaling group and the stop action is not allowed by the ASG. But based on the policy alone, the user should be able to stop. However, the question says 'unable to stop'. Actually, the Deny statement only applies to TerminateInstances. So the correct answer is D: The policy does not restrict stop actions, so the issue is elsewhere. But the question asks 'Which statement explains the failure?' The options are about the policy. Let's review: Option A says the Deny statement prevents stop, which is false. Option B says the Allow statement only gives describe, but it gives start and stop. Option C says the condition on the Deny statement incorrectly uses StringNotEquals. Option D says the policy does not prevent stopping instances with Development tag. Actually, the user can stop Development instances because the Deny only applies to terminate. So the failure must be due to something else. However, the question expects D as correct because the policy is not the cause. But that doesn't 'explain the failure'. Hmm. I think the intended answer is D: The policy does not prevent stopping instances with the Development tag, so the failure is not due to this policy. But that doesn't explain why they can't stop. Maybe the exhibit is about a different issue. Let me re-read: 'unable to stop an EC2 instance with the tag Environment: Development'. The policy allows StopInstances on all resources. So why can't they stop? Possibly because there is another policy denying it. But the question is to explain based on the exhibit. The best answer is D because the policy shown does not deny stop. So the failure must be due to another reason. I'll go with D.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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