DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 data engineer needs to share an S3 bucket with another AWS account. They want to ensure that the objects in the bucket remain encrypted with SSE-KMS using a customer managed key. What additional step is required for cross-account access?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the KMS key policy to grant the target account kms:Decrypt permission
When using SSE-KMS with a customer managed key, the key policy must grant the target account's IAM role or user permission to use the key. S3 bucket policy and IAM permissions are also required, but the key policy is the additional step specific to KMS. Option A is wrong because the bucket policy alone does not grant KMS permissions. Option B is wrong because the target account's IAM policy alone cannot override the key policy. Option D is wrong because disabling encryption is not required.
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.
✓
Modify the KMS key policy to grant the target account kms:Decrypt permission
Why this is correct
The KMS key policy must allow the target account to use the key for decryption.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add an IAM policy in the target account to allow kms:Decrypt
Why it's wrong here
The target account's IAM policy is insufficient; the key policy must also allow it.
✗
Disable SSE-KMS encryption on the bucket
Why it's wrong here
Disabling encryption would reduce security and is not required.
✗
Add a bucket policy that grants the target account s3:GetObject
Why it's wrong here
Bucket policy is needed, but it does not grant KMS decrypt permissions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Modify the KMS key policy to grant the target account kms:Decrypt permission — When using SSE-KMS with a customer managed key, the key policy must grant the target account's IAM role or user permission to use the key. S3 bucket policy and IAM permissions are also required, but the key policy is the additional step specific to KMS. Option A is wrong because the bucket policy alone does not grant KMS permissions. Option B is wrong because the target account's IAM policy alone cannot override the key policy. Option D is wrong because disabling encryption is not required.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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.
Question Discussion
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