The answer is to add a kms:Decrypt permission to the IAM role for the specific KMS key used to encrypt the S3 bucket. This is required because when a SageMaker training job accesses a KMS-encrypted S3 bucket, the IAM role must have explicit permission to decrypt the data using that key; S3 access permissions alone are insufficient, as SageMaker cannot read the encrypted objects without the kms:Decrypt action on the customer-managed key. On the AWS Certified AI Practitioner AIF-C01 exam, this scenario tests your understanding of how KMS integrates with SageMaker and S3, often appearing as a trick where candidates assume S3 read/write permissions are enough. A common trap is forgetting that server-side encryption with KMS adds a separate decryption authorization layer. Memory tip: think "S3 for access, KMS for decryption" — you need both permissions for encrypted data.
AIF-C01 Practice Question: Security, Compliance and Governance for AI Solutions
This AIF-C01 practice question tests your understanding of security, compliance and governance for ai solutions. 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 machine learning engineer notices that a SageMaker training job failed due to insufficient permissions to access a KMS-encrypted S3 bucket. The training job's IAM role has S3 access permissions. What should be done to resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a kms:Decrypt permission to the IAM role for the specific KMS key used to encrypt the S3 bucket
The training job failed because the IAM role lacks permission to decrypt the KMS key used for S3 server-side encryption. Even with S3 access permissions, SageMaker cannot read encrypted objects without the kms:Decrypt action on the specific KMS key. Adding kms:Decrypt to the role's policy for that key resolves the issue.
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 new KMS key and re-encrypt the data
Why it's wrong here
This is unnecessary and time-consuming; the issue is lack of permissions.
✗
Assign the SageMakerFullAccess policy to the role
Why it's wrong here
SageMakerFullAccess includes many permissions but may not include the specific KMS decrypt; it's also overly permissive.
✓
Add a kms:Decrypt permission to the IAM role for the specific KMS key used to encrypt the S3 bucket
Why this is correct
The role needs decryption permissions to access the encrypted data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the S3 bucket's default encryption to S3-managed keys (SSE-S3)
Why it's wrong here
This would change the encryption method but may not be allowed or desired; also the role would need new permissions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume S3 permissions alone are sufficient, overlooking that KMS-encrypted objects require explicit kms:Decrypt permissions on the IAM role, not just S3 bucket policies or managed policies like SageMakerFullAccess.
Detailed technical explanation
How to think about this question
When an S3 bucket uses SSE-KMS, SageMaker's training container must call the KMS Decrypt API to read training data. The IAM role must have a policy allowing kms:Decrypt on the specific KMS key ARN (or use a key policy granting the role). Without this, the GetObject call returns an access denied error even if S3 permissions are correct. This is a common pitfall when transitioning from SSE-S3 to SSE-KMS for compliance.
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.
Security, Compliance and Governance for AI Solutions — This question tests Security, Compliance and Governance for AI Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a kms:Decrypt permission to the IAM role for the specific KMS key used to encrypt the S3 bucket — The training job failed because the IAM role lacks permission to decrypt the KMS key used for S3 server-side encryption. Even with S3 access permissions, SageMaker cannot read encrypted objects without the kms:Decrypt action on the specific KMS key. Adding kms:Decrypt to the role's policy for that key resolves the issue.
What should I do if I get this AIF-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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Question Discussion
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