This MLS-C01 practice question tests your understanding of modeling. 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.
A data scientist has this IAM policy attached to their role. When trying to create a SageMaker endpoint using the AWS CLI, they get an 'AccessDenied' error. 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.
The role does not have permission to use KMS to decrypt the model artifacts
Why wrong: This is not the most likely reason. KMS decryption permissions are only necessary if the model artifacts are encrypted with a KMS key. The question does not indicate that encryption is used.
B
The policy does not include 'sagemaker:InvokeEndpoint' action
Why wrong: Incorrect. sagemaker:InvokeEndpoint is not required to create an endpoint; it is used to invoke the endpoint after it is deployed. The error occurs during creation, not invocation.
C
The role does not have permission to access the S3 bucket containing the model artifacts
Correct. To create a SageMaker endpoint, the user's IAM role requires permission to read the model artifacts from S3 (s3:GetObject). If this permission is missing, the CreateEndpoint API call will return AccessDenied.
D
The policy uses a wildcard '*' for resources instead of specific ARNs
Why wrong: Incorrect. Using a wildcard '*' for resources is common and does not inherently cause AccessDenied errors. The issue is more likely a missing action or resource-specific permission.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The role does not have permission to access the S3 bucket containing the model artifacts
The correct answer is C. The role does not have permission to access the S3 bucket containing the model artifacts. When creating a SageMaker endpoint, the service needs to access the model artifacts stored in S3. The IAM role attached to the data scientist must have s3:GetObject permission on the bucket. Without this, the CreateEndpoint API call will fail with AccessDenied. Option B is incorrect because sagemaker:InvokeEndpoint is not required to create an endpoint; it is needed for invoking the endpoint after creation. Option A is less likely because KMS decryption is only needed if the model artifacts are encrypted with a customer-managed KMS key. Option D is not a typical cause because using a wildcard '*' for resources is acceptable and does not cause AccessDenied errors.
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 does not have permission to use KMS to decrypt the model artifacts
Why it's wrong here
This is not the most likely reason. KMS decryption permissions are only necessary if the model artifacts are encrypted with a KMS key. The question does not indicate that encryption is used.
✗
The policy does not include 'sagemaker:InvokeEndpoint' action
Why it's wrong here
Incorrect. sagemaker:InvokeEndpoint is not required to create an endpoint; it is used to invoke the endpoint after it is deployed. The error occurs during creation, not invocation.
✓
The role does not have permission to access the S3 bucket containing the model artifacts
Why this is correct
Correct. To create a SageMaker endpoint, the user's IAM role requires permission to read the model artifacts from S3 (s3:GetObject). If this permission is missing, the CreateEndpoint API call will return AccessDenied.
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 policy uses a wildcard '*' for resources instead of specific ARNs
Why it's wrong here
Incorrect. Using a wildcard '*' for resources is common and does not inherently cause AccessDenied errors. The issue is more likely a missing action or resource-specific permission.
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.
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 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.
Modeling — This question tests Modeling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The role does not have permission to access the S3 bucket containing the model artifacts — The correct answer is C. The role does not have permission to access the S3 bucket containing the model artifacts. When creating a SageMaker endpoint, the service needs to access the model artifacts stored in S3. The IAM role attached to the data scientist must have s3:GetObject permission on the bucket. Without this, the CreateEndpoint API call will fail with AccessDenied. Option B is incorrect because sagemaker:InvokeEndpoint is not required to create an endpoint; it is needed for invoking the endpoint after creation. Option A is less likely because KMS decryption is only needed if the model artifacts are encrypted with a customer-managed KMS key. Option D is not a typical cause because using a wildcard '*' for resources is acceptable and does not cause AccessDenied errors.
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.
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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