DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. 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.
During an incident, an engineer needs to quickly revoke access to a compromised IAM user. Which action should be taken FIRST?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach an AWS managed policy that explicitly denies all actions (e.g., AWSDenyAll).
Option B is correct because attaching a deny-all policy immediately blocks all actions. Option A is wrong because deleting the user may fail if there are dependencies. Option C is wrong because signing certificates are only for programmatic access, not console. Option D is wrong because rotating keys does not revoke existing sessions.
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 an AWS managed policy that explicitly denies all actions (e.g., AWSDenyAll).
Why this is correct
A deny-all policy takes immediate effect, revoking all permissions.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Delete the IAM user immediately.
Why it's wrong here
Deletion might be delayed if the user owns resources like S3 buckets.
✗
Disable the user's signing certificates.
Why it's wrong here
This only affects API/CLI access, not console access.
✗
Rotate the user's access keys.
Why it's wrong here
Rotating keys invalidates old keys but does not revoke active sessions.
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 DOP-C02 ACL questions on filtering logic and placement.
Incident and Event Response — This question tests Incident and Event Response — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Attach an AWS managed policy that explicitly denies all actions (e.g., AWSDenyAll). — Option B is correct because attaching a deny-all policy immediately blocks all actions. Option A is wrong because deleting the user may fail if there are dependencies. Option C is wrong because signing certificates are only for programmatic access, not console. Option D is wrong because rotating keys does not revoke existing sessions.
What should I do if I get this DOP-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 DOP-C02 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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