SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing 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 company has an IAM policy attached to a user. When the user tries to stop an EC2 instance using the AWS CLI, they receive an 'AccessDenied' error. The instance is tagged with 'Environment=Production'. 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.
The user is using an incorrect CLI command syntax.
Why wrong: Option A is incorrect because an incorrect CLI command syntax would result in a syntax error, not an 'AccessDenied' error. The 'AccessDenied' error indicates a permissions issue.
B
The policy does not allow the ec2:StopInstances action for instances with the 'Environment=Production' tag.
Why wrong: Option B is incorrect because the policy likely does not include a condition that denies based on tags. The user has the StopInstances permission, but the AccessDenied suggests a broader denial.
C
The policy does not specify the instance ID in the Resource field.
Why wrong: Option C is incorrect because IAM policies can use wildcard (*) in the Resource field to allow actions on all resources. The error is not due to missing instance ID in the policy.
D
A service control policy (SCP) or a resource-based policy is denying the action.
Option D is correct because a service control policy (SCP) or resource-based policy can deny actions even if the user's IAM policy allows them. This is the most likely cause of the 'AccessDenied' error.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A service control policy (SCP) or a resource-based policy is denying the action.
The 'AccessDenied' error despite having the StopInstances permission indicates that something else is denying the action. The most likely cause is a service control policy (SCP) attached at the account or organizational level, or a resource-based policy on the EC2 instance itself that explicitly denies the action. Option A is wrong because incorrect CLI syntax would cause a different error. Option B is wrong because the policy may not have a tag-based condition; the issue is not about missing tag permissions. Option C is wrong because the policy can use a wildcard for the Resource field, so not specifying an instance ID does not cause AccessDenied. Option D correctly identifies that an SCP or resource-based policy is denying the action.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 user is using an incorrect CLI command syntax.
Why it's wrong here
Option A is incorrect because an incorrect CLI command syntax would result in a syntax error, not an 'AccessDenied' error. The 'AccessDenied' error indicates a permissions issue.
✗
The policy does not allow the ec2:StopInstances action for instances with the 'Environment=Production' tag.
Why it's wrong here
Option B is incorrect because the policy likely does not include a condition that denies based on tags. The user has the StopInstances permission, but the AccessDenied suggests a broader denial.
✗
The policy does not specify the instance ID in the Resource field.
Why it's wrong here
Option C is incorrect because IAM policies can use wildcard (*) in the Resource field to allow actions on all resources. The error is not due to missing instance ID in the policy.
✓
A service control policy (SCP) or a resource-based policy is denying the action.
Why this is correct
Option D is correct because a service control policy (SCP) or resource-based policy can deny actions even if the user's IAM policy allows them. This is the most likely cause of the 'AccessDenied' error.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
Option A is incorrect because an incorrect CLI command syntax would result in a syntax error, not an 'AccessDenied' error. The 'AccessDenied' error indicates a permissions issue.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: A service control policy (SCP) or a resource-based policy is denying the action. — The 'AccessDenied' error despite having the StopInstances permission indicates that something else is denying the action. The most likely cause is a service control policy (SCP) attached at the account or organizational level, or a resource-based policy on the EC2 instance itself that explicitly denies the action. Option A is wrong because incorrect CLI syntax would cause a different error. Option B is wrong because the policy may not have a tag-based condition; the issue is not about missing tag permissions. Option C is wrong because the policy can use a wildcard for the Resource field, so not specifying an instance ID does not cause AccessDenied. Option D correctly identifies that an SCP or resource-based policy is denying the action.
What should I do if I get this SAP-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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