← DOP-C02·Amazon Web Services

Question 81 of 1,750

Incident and Event Response →mediumMultiple ChoiceObjective-mapped

Immediate Revocation of Compromised IAM User Permissions

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.

A
Attach an AWS managed policy that explicitly denies all actions (e.g., AWSDenyAll).
A deny-all policy takes immediate effect, revoking all permissions.
B
Delete the IAM user immediately.
Why wrong: Deletion might be delayed if the user owns resources like S3 buckets.
C
Disable the user's signing certificates.
Why wrong: This only affects API/CLI access, not console access.
D
Rotate the user's access keys.
Why wrong: Rotating keys invalidates old keys but does not revoke active sessions.

Full breakdown with real-world context →

Answer choices

Why each option matters

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 A is correct because attaching a deny-all policy (e.g., AWSDenyAll) to the IAM user immediately revokes all permissions, including existing sessions, without risk of breaking dependencies. Deleting the user (B) may fail if the user is referenced by resources or logs, and it does not block existing sessions immediately. Disabling signing certificates (C) only affects programmatic access via CLI/SDK, leaving console sessions active. Rotating access keys (D) invalidates old keys but does not affect existing sessions that already have credentials; sessions remain active until they expire. Therefore, the first action should be to apply a deny-all policy to instantly block all actions.

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.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

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 A is correct because attaching a deny-all policy (e.g., AWSDenyAll) to the IAM user immediately revokes all permissions, including existing sessions, without risk of breaking dependencies. Deleting the user (B) may fail if the user is referenced by resources or logs, and it does not block existing sessions immediately. Disabling signing certificates (C) only affects programmatic access via CLI/SDK, leaving console sessions active. Rotating access keys (D) invalidates old keys but does not affect existing sessions that already have credentials; sessions remain active until they expire. Therefore, the first action should be to apply a deny-all policy to instantly block all actions.

What should I do if I get this DOP-C02 question wrong?

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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Same concept, more angles

1 more ways this is tested on DOP-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. During an incident, a DevOps engineer needs to quickly revoke access to a set of IAM users who are suspected to be compromised. The users have programmatic access keys and console passwords. The engineer wants to minimize the impact on non-compromised users. Which action should the engineer take FIRST?

hard

A.Delete the compromised IAM users.
✓ B.Attach an IAM policy that explicitly denies all actions to the compromised users.
C.Delete the access keys of the compromised users.
D.Change the IAM password policy to require strong passwords.

Why B: Option B is the correct first action because attaching an IAM policy that explicitly denies all actions quickly revokes both programmatic and console access for the compromised users without deleting their credentials, preserving them for investigation and minimizing impact on non-compromised users. Deleting access keys (Option C) would only revoke programmatic access, not console access. Deleting users (Option A) is irreversible and loses audit trails. Changing the password policy (Option D) affects all users, not just the compromised ones.

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Question Discussion

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This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.