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Data Security and Governance →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to use the AWS managed key for Amazon S3 (aws/s3) for server-side encryption. This is correct because AWS KMS automatically rotates AWS managed keys every 365 days (or less) with zero configuration or maintenance required from the data engineer, directly satisfying the compliance requirement for automatic kms key rotation s3 without any manual intervention. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of the operational overhead differences between key types—specifically, that AWS managed keys offer hands-off rotation while customer managed keys require custom automation or manual rotation. A common trap is assuming you must create a customer managed key with a rotation policy, but that adds unnecessary complexity. Memory tip: think “managed means managed for you”—if the requirement is purely automatic rotation with least effort, always default to the AWS managed key.

DEA-C01 Data Security and Governance Practice Question

This DEA-C01 practice question tests your understanding of data security and governance. 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 financial services company uses AWS KMS to encrypt data in Amazon S3. The compliance team requires that all encryption keys be rotated automatically every 365 days. The data engineer needs to implement this requirement without manual intervention. Which solution meets the requirement with the LEAST operational overhead?

Clue words in this question

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

Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.

Question 1hardmultiple choice

Full question →

A
Create a customer managed key (CMK) in KMS with automatic rotation enabled every 365 days. Use this CMK to encrypt S3 objects.
Why wrong: CMKs with automatic rotation work but have more overhead (cost, key policy management) than AWS managed keys.
B
Create a customer managed key with imported key material and configure a Lambda function to rotate the key every 365 days.
Why wrong: Imported key material does not support automatic rotation; manual or custom rotation is required.
C
Use the AWS managed key for Amazon S3 (aws/s3) for server-side encryption.
AWS managed keys are automatically rotated every year with no operational overhead.
D
Use S3 server-side encryption with S3 managed keys (SSE-S3).
Why wrong: SSE-S3 also rotates keys automatically but the question expects KMS; SSE-S3 is less configurable but still rotates, but AWS managed key is the intended answer for KMS scenario.

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

✓

Use the AWS managed key for Amazon S3 (aws/s3) for server-side encryption.

Option C is correct because the AWS managed key for Amazon S3 (aws/s3) is automatically rotated by AWS every 365 days (or less) with no configuration or maintenance required. This satisfies the compliance requirement with zero operational overhead, as the rotation is handled entirely by the AWS KMS service without any manual intervention or custom automation.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Create a customer managed key (CMK) in KMS with automatic rotation enabled every 365 days. Use this CMK to encrypt S3 objects.
Why it's wrong here
CMKs with automatic rotation work but have more overhead (cost, key policy management) than AWS managed keys.
✗
Create a customer managed key with imported key material and configure a Lambda function to rotate the key every 365 days.
Why it's wrong here
Imported key material does not support automatic rotation; manual or custom rotation is required.
✓
Use the AWS managed key for Amazon S3 (aws/s3) for server-side encryption.
Why this is correct
AWS managed keys are automatically rotated every year with no operational overhead.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use S3 server-side encryption with S3 managed keys (SSE-S3).
Why it's wrong here
SSE-S3 also rotates keys automatically but the question expects KMS; SSE-S3 is less configurable but still rotates, but AWS managed key is the intended answer for KMS scenario.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume customer managed keys (CMK) with automatic rotation are the only way to meet a specific rotation interval, overlooking that AWS managed keys already rotate on a 365-day schedule and require zero configuration, making them the least overhead solution.

Trap categories for this question

Scenario analysis trap
SSE-S3 also rotates keys automatically but the question expects KMS; SSE-S3 is less configurable but still rotates, but AWS managed key is the intended answer for KMS scenario.

Detailed technical explanation

How to think about this question

AWS managed keys (e.g., aws/s3) are rotated automatically every 365 days (or sooner) by AWS, and the rotation is transparent to the user—old key material remains available for decryption of previously encrypted data. In contrast, customer managed keys with automatic rotation rotate annually but require the key to be created without imported material, and the rotation schedule is fixed at 365 days (cannot be customized). SSE-S3 uses envelope encryption with a unique key per object, but the master key rotation is not guaranteed to occur at a fixed 365-day interval, making it unsuitable for strict compliance requirements.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DEA-C01 question test?

Data Security and Governance — This question tests Data Security and Governance — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use the AWS managed key for Amazon S3 (aws/s3) for server-side encryption. — Option C is correct because the AWS managed key for Amazon S3 (aws/s3) is automatically rotated by AWS every 365 days (or less) with no configuration or maintenance required. This satisfies the compliance requirement with zero operational overhead, as the rotation is handled entirely by the AWS KMS service without any manual intervention or custom automation.

What should I do if I get this DEA-C01 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DEA-C01 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 DEA-C01 exam.