SCS-C02 Identity and Access Management Practice Question
This SCS-C02 practice question tests your understanding of identity and access management. 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.
A security engineer notices that an IAM role allows an EC2 instance to access a DynamoDB table. The instance is compromised. What is the best way to immediately revoke the instance's access without affecting other resources that use the same role?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach a permissions boundary to the role that denies all DynamoDB actions.
Option C is correct: using a permissions boundary can limit the role's permissions. Option A is wrong because deleting the role would affect all resources using it. Option B is wrong because stopping the instance may not be immediate and could be delayed. Option D is wrong because modifying the trust policy would break all instances using that role.
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.
✓
Attach a permissions boundary to the role that denies all DynamoDB actions.
Why this is correct
A permissions boundary can restrict the role's permissions without deleting it.
Clue confirmation
The clue words "best", "immediately / without restart" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Stop the EC2 instance.
Why it's wrong here
Stopping the instance does not revoke the credentials already issued; the instance might still have active credentials.
✗
Modify the trust policy of the role to deny the instance's ARN.
Why it's wrong here
The trust policy is for the service principal, not individual instances.
✗
Delete the IAM role.
Why it's wrong here
This would affect all resources using the role, not just the compromised instance.
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.
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 SCS-C02 ACL questions on filtering logic and placement.
Identity and Access Management — This question tests Identity and Access Management — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Attach a permissions boundary to the role that denies all DynamoDB actions. — Option C is correct: using a permissions boundary can limit the role's permissions. Option A is wrong because deleting the role would affect all resources using it. Option B is wrong because stopping the instance may not be immediate and could be delayed. Option D is wrong because modifying the trust policy would break all instances using that role.
What should I do if I get this SCS-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 SCS-C02 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "best", "immediately / without restart". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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