- A
Add a lifecycle configuration script
Why wrong: Does not grant KMS permissions.
- B
Modify the bucket policy to allow s3:GetObject
Why wrong: Bucket policy alone does not cover KMS.
- C
Place the notebook instance in a VPC
Why wrong: Not required for KMS access.
- D
Attach a policy to the notebook's IAM role that allows kms:Decrypt
Needed to decrypt objects encrypted with SSE-KMS.
Question 352 of 1,755
Configuring SageMaker Notebook Access to SSE-KMS Encrypted S3 Buckets
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. 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 data scientist needs to create a SageMaker notebook instance with access to a private S3 bucket. The bucket uses SSE-KMS encryption. Which additional configuration is required?
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
✓
Attach a policy to the notebook's IAM role that allows kms:Decrypt
Option D is correct because when an S3 bucket uses SSE-KMS encryption, the SageMaker notebook instance's IAM role must include a policy that allows the kms:Decrypt action. This is necessary because SageMaker needs to decrypt the data using the KMS key when reading objects from the bucket. Without this permission, the notebook instance will fail to access the encrypted S3 objects, even if the bucket policy allows s3:GetObject.
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.
- ✗
Add a lifecycle configuration script
Why it's wrong here
Does not grant KMS permissions.
- ✗
Modify the bucket policy to allow s3:GetObject
Why it's wrong here
Bucket policy alone does not cover KMS.
- ✗
Place the notebook instance in a VPC
Why it's wrong here
Not required for KMS access.
- ✓
Attach a policy to the notebook's IAM role that allows kms:Decrypt
Why this is correct
Needed to decrypt objects encrypted with SSE-KMS.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume that modifying the bucket policy (Option B) or placing the notebook in a VPC (Option C) is sufficient, overlooking the fact that SSE-KMS requires explicit KMS key permissions in the IAM role, not just S3-level access controls.
Detailed technical explanation
How to think about this question
SSE-KMS encryption uses AWS KMS customer master keys (CMKs) to encrypt S3 objects at rest. When SageMaker reads an encrypted object, it sends a kms:Decrypt request to KMS, which requires the IAM role to have the kms:Decrypt permission for the specific KMS key. Additionally, the KMS key policy must grant the IAM role access, and if the bucket is in a different account, cross-account KMS permissions are also needed. This is distinct from SSE-S3, where only s3:GetObject is required.
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.
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.
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attach a policy to the notebook's IAM role that allows kms:Decrypt — Option D is correct because when an S3 bucket uses SSE-KMS encryption, the SageMaker notebook instance's IAM role must include a policy that allows the kms:Decrypt action. This is necessary because SageMaker needs to decrypt the data using the KMS key when reading objects from the bucket. Without this permission, the notebook instance will fail to access the encrypted S3 objects, even if the bucket policy allows s3:GetObject.
What should I do if I get this MLS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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