The answer is that the training job will fail with an access denied error. This occurs because IAM explicit deny overrides allow SageMaker access, even when a broader Allow statement grants permission on the parent path. In this case, the policy allows s3:GetObject on my-bucket/* but then explicitly denies it on my-bucket/confidential/*, and since an explicit Deny is an absolute override, the data scientist cannot read the training data from that subfolder. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this tests your understanding of IAM policy evaluation logic, specifically that Deny always wins over Allow regardless of order. A common trap is assuming a more specific Allow can bypass a general Deny, but the opposite is true. Remember the mnemonic: “Deny is the final say, no matter the way.”
MLS-C01 Modeling Practice Question
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.
Refer to the exhibit. An IAM policy is attached to a SageMaker execution role. A data scientist tries to create a training job that reads training data from s3://my-bucket/confidential/data.csv. What will happen?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The training job will fail with an access denied error
The policy allows s3:GetObject on my-bucket/* but explicitly denies s3:GetObject on my-bucket/confidential/*. Since explicit Deny overrides any Allow, the training job will fail with an access denied error.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 training job will succeed because there is an Allow on my-bucket/*
Why it's wrong here
Explicit Deny overrides Allow.
✗
The training job will succeed because the Deny statement is invalid
Why it's wrong here
The Deny is valid and takes precedence.
✗
The training job will fail because the role lacks sagemaker:CreateTrainingJob
Why it's wrong here
The role has sagemaker:CreateTrainingJob on all resources.
✓
The training job will fail with an access denied error
Why this is correct
The Deny statement blocks access to the confidential prefix.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related MLS-C01 ACL questions on filtering logic and placement.
Modeling — This question tests Modeling — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The training job will fail with an access denied error — The policy allows s3:GetObject on my-bucket/* but explicitly denies s3:GetObject on my-bucket/confidential/*. Since explicit Deny overrides any Allow, the training job will fail with an access denied error.
What should I do if I get this MLS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related MLS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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