← SOA-C02·Amazon Web Services

Question 142 of 1,546

Security and Compliance →mediumMultiple ChoiceObjective-mapped

Enforce Retention Period for Audit Logs with S3 Object Lock — AWS SysOps Explained

This SOA-C02 practice question tests your understanding of security and compliance. 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 has a requirement to store audit logs for a minimum of 7 years to comply with regulatory standards. The logs are currently stored in Amazon S3. The SysOps administrator needs to ensure that logs are not deleted before the retention period expires. Which solution should be implemented?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
Enable MFA Delete on the bucket to require multi-factor authentication for deletions.
Why wrong: MFA delete can be bypassed by root user and does not enforce time-based retention.
B
Enable versioning on the bucket and use lifecycle policies to transition objects to S3 Glacier.
Why wrong: Versioning does not prevent deletion; lifecycle can delete.
C
Create an S3 bucket policy that denies s3:DeleteObject for all principals.
Why wrong: Bucket policy can be changed; not a strong retention mechanism.
D
Enable S3 Object Lock with a retention mode of GOVERNANCE or COMPLIANCE and set a retention period of 7 years.
Object Lock prevents deletion during retention period.

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

✓

Enable S3 Object Lock with a retention mode of GOVERNANCE or COMPLIANCE and set a retention period of 7 years.

Option D is correct because S3 Object Lock with a retention mode (GOVERNANCE or COMPLIANCE) prevents objects from being deleted or overwritten until the retention period expires. This ensures logs are retained for 7 years. Option A is incorrect because MFA Delete provides an extra layer of security but can still be bypassed by the root user and does not enforce a minimum retention period; it only requires MFA for deletion, but deletion is still possible. Option B is incorrect because versioning alone does not prevent deletion; it allows recovering deleted objects but does not enforce retention. Lifecycle policies can transition objects to S3 Glacier but do not prevent deletion. Option C is incorrect because a bucket policy denying s3:DeleteObject for all principals would also prevent the bucket owner from deleting objects, which is not practical and can be overridden by an explicit allow. Moreover, such a policy does not enforce a retention period; it can be changed at any time. S3 Object Lock is the appropriate solution to meet the 7-year retention requirement.

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 MFA Delete on the bucket to require multi-factor authentication for deletions.
Why it's wrong here
MFA delete can be bypassed by root user and does not enforce time-based retention.
✗
Enable versioning on the bucket and use lifecycle policies to transition objects to S3 Glacier.
Why it's wrong here
Versioning does not prevent deletion; lifecycle can delete.
✗
Create an S3 bucket policy that denies s3:DeleteObject for all principals.
Why it's wrong here
Bucket policy can be changed; not a strong retention mechanism.
✓
Enable S3 Object Lock with a retention mode of GOVERNANCE or COMPLIANCE and set a retention period of 7 years.
Why this is correct
Object Lock prevents deletion during retention period.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.

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 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.

Quick reference

AWS S3 Storage Class Comparison

Storage Class	Min Duration	Retrieval	Use Case
S3 Standard	None	Immediate	Frequently accessed data
S3 Standard-IA	30 days	Immediate	Infrequent access, rapid retrieval
S3 One Zone-IA	30 days	Immediate	Non-critical infrequent data
S3 Intelligent-Tiering	None	Immediate–hours	Unknown or changing access patterns
S3 Glacier Instant	90 days	Milliseconds	Archive with instant retrieval
S3 Glacier Flexible	90 days	Minutes–hours	Archive, flexible retrieval
S3 Glacier Deep Archive	180 days	Hours	Long-term compliance archive

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 SOA-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Enable S3 Object Lock with a retention mode of GOVERNANCE or COMPLIANCE and set a retention period of 7 years. — Option D is correct because S3 Object Lock with a retention mode (GOVERNANCE or COMPLIANCE) prevents objects from being deleted or overwritten until the retention period expires. This ensures logs are retained for 7 years. Option A is incorrect because MFA Delete provides an extra layer of security but can still be bypassed by the root user and does not enforce a minimum retention period; it only requires MFA for deletion, but deletion is still possible. Option B is incorrect because versioning alone does not prevent deletion; it allows recovering deleted objects but does not enforce retention. Lifecycle policies can transition objects to S3 Glacier but do not prevent deletion. Option C is incorrect because a bucket policy denying s3:DeleteObject for all principals would also prevent the bucket owner from deleting objects, which is not practical and can be overridden by an explicit allow. Moreover, such a policy does not enforce a retention period; it can be changed at any time. S3 Object Lock is the appropriate solution to meet the 7-year retention requirement.

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

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

Standard ACLs match source addresses.

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