Quick Answer
The answer is enabling MFA Delete on the S3 bucket. This configuration requires multi-factor authentication for any operation that permanently deletes an object version, effectively preventing accidental permanent deletion even if a user has standard delete permissions. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding that versioning alone is not enough—without MFA Delete, a user can still delete version markers or permanently delete versions. A common trap is assuming lifecycle policies or bucket policies alone can block deletion, but only MFA Delete adds the extra authentication layer for version deletion. Remember the memory tip: "MFA Delete is the final lock on the versioning vault"—it ensures that even authorized users cannot permanently remove data without a second factor.
This SOA-C02 practice question tests your understanding of reliability and business continuity. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 SysOps administrator needs to ensure that an S3 bucket can recover from accidental deletions by users. The bucket stores versioned objects. What additional configuration should be enabled to prevent permanent deletion?
Enable S3 Server-Side Encryption.
Why wrong: Encryption protects data at rest, not against deletion.
Enable S3 Lifecycle rules to expire objects.
Why wrong: Lifecycle rules automate deletion, not prevent it.
Enable MFA Delete on the bucket.
MFA Delete requires extra authentication to delete versions.
Configure a bucket policy to deny s3:DeleteObject.
Why wrong: A blanket deny prevents all deletions, including legitimate ones.
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.
Option C is correct because MFA Delete requires multi-factor authentication to delete versions, preventing accidental permanent deletion. Option A is wrong because lifecycle policies do not protect against deletion. Option B is wrong because encryption does not prevent deletion. Option D is wrong because bucket policies can allow/deny but not require MFA for deletion of versions without additional configuration.
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 S3 Server-Side Encryption.
Why it's wrong here
Encryption protects data at rest, not against deletion.
Enable S3 Lifecycle rules to expire objects.
Why it's wrong here
Lifecycle rules automate deletion, not prevent it.
Enable MFA Delete on the bucket.
Why this is correct
MFA Delete requires extra authentication to delete versions.
Related concept
Standard ACLs match source addresses.
Configure a bucket policy to deny s3:DeleteObject.
Why it's wrong here
A blanket deny prevents all deletions, including legitimate ones.
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 SOA-C02 ACL questions on filtering logic and placement.
Reliability and Business Continuity — study guide chapter
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Reliability and Business Continuity practice questions
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FAQ
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Standard ACLs match source addresses..
The correct answer is: Enable MFA Delete on the bucket. — Option C is correct because MFA Delete requires multi-factor authentication to delete versions, preventing accidental permanent deletion. Option A is wrong because lifecycle policies do not protect against deletion. Option B is wrong because encryption does not prevent deletion. Option D is wrong because bucket policies can allow/deny but not require MFA for deletion of versions without additional configuration.
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 SOA-C02 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
This SOA-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 SOA-C02 exam.
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