Quick Answer
The answer is to enable MFA Delete and add a bucket policy that explicitly denies the s3:DeleteBucket action. MFA Delete requires a second authentication factor before any object version can be permanently deleted or the bucket itself can be removed, adding a critical layer of protection against accidental or unauthorized deletion. Meanwhile, a bucket policy that denies the s3:DeleteBucket action acts as a direct permission guard, ensuring that even if an IAM user or role has broad rights, the bucket cannot be deleted unless that specific deny statement is removed. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of preventive controls versus detective or lifecycle-based features; a common trap is confusing versioning or CloudTrail with deletion prevention, but versioning only protects objects, not the bucket itself. Remember the memory tip: “MFA for objects, Deny for the bucket itself” to quickly recall which tool applies to which risk.
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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.
Which TWO actions can help protect against accidental deletion of an Amazon S3 bucket? (Select TWO.)
Enable versioning on the bucket.
Why wrong: Versioning protects objects, not bucket deletion.
Enable AWS CloudTrail to log delete events.
Why wrong: Logging does not prevent deletion.
Enable MFA Delete on the bucket.
Requires MFA to delete objects.
Configure a lifecycle policy to expire objects.
Why wrong: Lifecycle removes objects, not protect.
Add a bucket policy that explicitly denies the s3:DeleteBucket action.
Prevents bucket deletion.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enable MFA Delete on the bucket.
Options A (MFA Delete) and D (bucket policy denying s3:DeleteBucket) are correct. MFA Delete requires multi-factor authentication to delete objects. A bucket policy can deny the DeleteBucket action. Option B is wrong because versioning does not prevent bucket deletion. Option C is wrong because lifecycle policies delete objects, not protect. Option E is wrong because CloudTrail is auditing, not prevention.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Enable versioning on the bucket.
Why it's wrong here
Versioning protects objects, not bucket deletion.
Enable AWS CloudTrail to log delete events.
Why it's wrong here
Logging does not prevent deletion.
Enable MFA Delete on the bucket.
Why this is correct
Requires MFA to delete objects.
Related concept
Standard ACLs match source addresses.
Configure a lifecycle policy to expire objects.
Why it's wrong here
Lifecycle removes objects, not protect.
Add a bucket policy that explicitly denies the s3:DeleteBucket action.
Why this is correct
Prevents bucket deletion.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
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.
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Standard ACLs match source addresses..
The correct answer is: Enable MFA Delete on the bucket. — Options A (MFA Delete) and D (bucket policy denying s3:DeleteBucket) are correct. MFA Delete requires multi-factor authentication to delete objects. A bucket policy can deny the DeleteBucket action. Option B is wrong because versioning does not prevent bucket deletion. Option C is wrong because lifecycle policies delete objects, not protect. Option E is wrong because CloudTrail is auditing, not prevention.
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.
Standard ACLs match source addresses.
About these practice questions
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Same concept, more angles
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. A company wants to ensure its data in Amazon S3 is protected against accidental deletion. The bucket stores critical documents. Which approach provides the HIGHEST level of resilience?
easyWhy C: Option D is correct because enabling versioning and MFA delete provides protection against both accidental overwrites and malicious deletions. Option A is wrong because lifecycle policies do not protect against deletion. Option B is wrong because cross-region replication protects against region failure but not accidental deletion. Option C is wrong because bucket policies only control access, not deletion recovery.
Variation 2. A company wants to ensure that its Amazon S3 bucket is resilient to accidental deletion of objects. Which TWO actions should be taken?
easyWhy A: Enable Versioning to keep multiple versions of objects, and enable MFA Delete to require multi-factor authentication for permanent deletions.
Variation 3. A company wants to protect its S3 bucket data from accidental deletion or overwrite. Which feature should be enabled?
easyWhy C: S3 Versioning keeps all versions, allowing recovery from deletes and overwrites. Option B is wrong because MFA Delete is an additional protection but not the primary. Option C is wrong because bucket policies control access. Option D is wrong because replication is for cross-region copies.
Last reviewed: Jun 20, 2026
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.
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