The correct answer is that the IAM policy condition enforces that the role can only use the specified KMS key when the request originates from Amazon S3. This is achieved through the kms:ViaService condition key, which restricts KMS actions to calls made by a specific AWS service on behalf of the principal. In this case, the condition explicitly sets kms:ViaService to s3.amazonaws.com, meaning the KMS key can only be used for encryption or decryption when the request comes through S3, not from AWS Glue or any other service. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding of how to narrow KMS key usage to a particular service, a common scenario for securing data at rest in S3 buckets. A frequent trap is confusing the service role’s source (Glue) with the service making the KMS request (S3), so remember that kms:ViaService identifies the downstream service, not the IAM role’s trust policy. Memory tip: think “ViaService = Via which service is the key being used?”—if it says S3, only S3 can call that key.
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The role can only use the KMS key when the request comes from S3
The condition restricts KMS actions to requests that come from S3 via the kms:ViaService condition key. Option B is wrong because it says Glue, but the condition is for S3. Option C is wrong because it's not for any service. Option D is wrong because it restricts to S3, not any KMS key. Option A is correct.
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.
✗
The role can use the KMS key from any AWS service
Why it's wrong here
Restricted to S3.
✗
The role can only use the KMS key when the request comes from Glue
Why it's wrong here
Condition is for S3, not Glue.
✗
The role can only use the KMS key for decrypting data
Why it's wrong here
Policy also allows ReEncrypt and GenerateDataKey.
✓
The role can only use the KMS key when the request comes from S3
Why this is correct
kms:ViaService limits to S3 endpoints.
Related concept
Read the scenario before looking for a memorised answer.
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: The role can only use the KMS key when the request comes from S3 — The condition restricts KMS actions to requests that come from S3 via the kms:ViaService condition key. Option B is wrong because it says Glue, but the condition is for S3. Option C is wrong because it's not for any service. Option D is wrong because it restricts to S3, not any KMS key. Option A is correct.
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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