The answer is to enable MFA Delete, enable versioning, and apply a bucket policy that denies s3:DeleteObject to all principals. MFA Delete requires a one-time code from a hardware or virtual MFA device to permanently delete object versions, adding a critical layer of defense against accidental or malicious deletion. Versioning preserves every object version, so even if an object is deleted, the previous version remains recoverable. A bucket policy that explicitly denies the s3:DeleteObject action prevents any user or service from deleting objects, regardless of their IAM permissions. On the AWS Certified Data Engineer Associate DEA-C01 exam, this combination tests your understanding of defense-in-depth for S3 durability—a common trap is confusing lifecycle policies (which automate deletion) with protection mechanisms. Remember the mnemonic “MVP” for MFA, Versioning, and Policy to guard against accidental deletion.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 company uses Amazon S3 to store data for analytics. The data engineer needs to ensure that the S3 bucket is protected against accidental deletion of objects. Which THREE actions should the engineer take? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an S3 bucket policy that explicitly denies the s3:DeleteObject action.
Option A is correct because MFA Delete adds an extra layer of protection. Option B is correct because versioning keeps multiple versions, allowing recovery. Option D is correct because a bucket policy denying s3:DeleteObject to all principals prevents any deletion. Option C is wrong because lifecycle policies delete objects automatically. Option E is wrong because server access logs are for 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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enable server access logging for the S3 bucket.
Why it's wrong here
Logs are for auditing, not prevention.
✓
Create an S3 bucket policy that explicitly denies the s3:DeleteObject action.
Why this is correct
Prevents any user from deleting objects.
Related concept
Standard ACLs match source addresses.
✗
Configure a lifecycle policy to transition objects to Glacier.
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 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
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 DEA-C01 ACL questions on filtering logic and placement.
Data Operations and Support — This question tests Data Operations and Support — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create an S3 bucket policy that explicitly denies the s3:DeleteObject action. — Option A is correct because MFA Delete adds an extra layer of protection. Option B is correct because versioning keeps multiple versions, allowing recovery. Option D is correct because a bucket policy denying s3:DeleteObject to all principals prevents any deletion. Option C is wrong because lifecycle policies delete objects automatically. Option E is wrong because server access logs are for auditing, not prevention.
What should I do if I get this DEA-C01 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 DEA-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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