The answer is kms:GenerateDataKey. SageMaker notebook instances require this permission when writing encrypted objects to S3 because the service must generate a new data key to encrypt the file before uploading it, and the provided IAM policy only includes s3:PutObject and kms:Decrypt, which are insufficient for encryption operations. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of how SageMaker interacts with S3 server-side encryption using AWS KMS—a common trap is assuming s3:PutObject alone is enough, or confusing kms:Decrypt (needed for reading) with kms:GenerateDataKey (needed for writing). Remember: to save encrypted files, SageMaker must generate a key, not just decrypt one. A useful memory tip is “Write needs Generate, Read needs Decrypt.”
MLS-C01 Exploratory Data Analysis Practice Question
This MLS-C01 practice question tests your understanding of exploratory data analysis. 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 scientist creates the above IAM policy and attaches it to a role used by an Amazon SageMaker notebook instance. When trying to save a file to the S3 bucket, the operation fails. What is the missing permission?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kms:GenerateDataKey
Option D is correct because SageMaker needs s3:PutObject, but also needs s3:GetObject for some operations. However, the error is likely due to missing encryption permissions. Option A is wrong because s3:ListBucket is for listing. Option B is wrong because kms:Decrypt is for reading. Option C is wrong because s3:GetObject is for reading.
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.
✗
kms:Decrypt
Why it's wrong here
Decrypt is for reading encrypted objects.
✗
s3:ListBucket
Why it's wrong here
ListBucket is for listing objects, not writing.
✓
kms:GenerateDataKey
Why this is correct
If the bucket uses SSE-KMS, PutObject requires kms:GenerateDataKey to encrypt the object.
Related concept
Read the scenario before looking for a memorised answer.
✗
s3:GetObject
Why it's wrong here
GetObject is for reading.
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 MLS-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.
Exploratory Data Analysis — This question tests Exploratory Data Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kms:GenerateDataKey — Option D is correct because SageMaker needs s3:PutObject, but also needs s3:GetObject for some operations. However, the error is likely due to missing encryption permissions. Option A is wrong because s3:ListBucket is for listing. Option B is wrong because kms:Decrypt is for reading. Option C is wrong because s3:GetObject is for reading.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-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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Question Discussion
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