MLA-C01 Practice Question: ML Solution Monitoring, Maintenance and Security
This MLA-C01 practice question tests your understanding of ml solution monitoring, maintenance and security. 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.
Refer to the exhibit. A data scientist uses a SageMaker notebook instance to read a model file from S3 bucket 'my-bucket'. The bucket uses SSE-KMS encryption with a KMS key. The IAM role attached to the notebook has the above policy. However, reading the file fails. What is the MOST likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The condition requires encryption to be AES256, which is SSE-S3, but the bucket uses KMS.
Option C is correct because the condition in the IAM policy explicitly requires `s3:x-amz-server-side-encryption` to be `AES256`, which corresponds to SSE-S3 (Amazon S3-managed keys). However, the bucket uses SSE-KMS encryption with a KMS key, so the encryption header in the request will be `aws:kms`, not `AES256`. This mismatch causes the condition to fail, and the `s3:GetObject` action is denied, even though the KMS permissions are present.
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 resource ARN for S3 does not include the bucket itself (only objects inside).
Why it's wrong here
For GetObject, the object ARN is sufficient; the bucket ARN is not required.
✗
The policy allows s3:GetObject only if server-side encryption is AES256, but the bucket uses KMS.
Why it's wrong here
This is partially correct but less precise; the condition demands AES256 header, not the actual encryption type.
✓
The condition requires encryption to be AES256, which is SSE-S3, but the bucket uses KMS.
Why this is correct
Correct. The condition checks for 'AES256' header, but SSE-KMS uses 'aws:kms', so the condition fails and access is denied.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The kms key ARN is incorrect.
Why it's wrong here
The key ARN appears valid, and KMS permission is given, but the S3 condition is the blocking issue.
✗
The policy allows kms:Decrypt but does not allow kms:GenerateDataKey.
Why it's wrong here
GenerateDataKey is not needed for reading an existing object; Decrypt is sufficient.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common mistake is to assume that the IAM condition `s3:x-amz-server-side-encryption` checks the encryption type of the stored object. In reality, it evaluates the encryption header in the request. If the request header is `aws:kms` but the condition requires `AES256`, the request is denied even if the KMS permissions are correct.
Detailed technical explanation
How to think about this question
When a request is made to S3 with SSE-KMS, the client must include the `x-amz-server-side-encryption: aws:kms` header. The IAM condition `s3:x-amz-server-side-encryption` evaluates this request header, not the encryption state of the object at rest. If the condition requires `AES256`, any request with `aws:kms` is denied. Additionally, the KMS key policy must also allow the IAM role to use the key; here, the KMS permission is granted but the S3 condition blocks the request before KMS is invoked.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
ML Solution Monitoring, Maintenance and Security — This question tests ML Solution Monitoring, Maintenance and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The condition requires encryption to be AES256, which is SSE-S3, but the bucket uses KMS. — Option C is correct because the condition in the IAM policy explicitly requires `s3:x-amz-server-side-encryption` to be `AES256`, which corresponds to SSE-S3 (Amazon S3-managed keys). However, the bucket uses SSE-KMS encryption with a KMS key, so the encryption header in the request will be `aws:kms`, not `AES256`. This mismatch causes the condition to fail, and the `s3:GetObject` action is denied, even though the KMS permissions are present.
What should I do if I get this MLA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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