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Question 415 of 507

ML Solution Monitoring, Maintenance and Security →easyMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the retraining role lacks the kms:Decrypt permission on the KMS key used for server-side encryption. This is the most likely cause because when an S3 object is encrypted with SSE-KMS, the S3 GetObject operation requires not only the s3:GetObject permission on the bucket and object but also the kms:Decrypt permission on the specific customer master key (CMK) that encrypted the object. The error message shows an AccessDenied, not a 404, confirming the object exists but the role cannot decrypt it. On the AWS Certified Machine Learning Engineer Associate MLA-C01 exam, this scenario tests your understanding of how KMS permissions interact with S3 access in SageMaker pipelines—a common trap is assuming S3 bucket policies alone cover encryption. Remember the mnemonic: “S3 gets the object, KMS unlocks the box”—without the key, you cannot read the data, even if the S3 door is open.

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.

An e-commerce company uses a SageMaker endpoint to serve a product recommendation model. The model is retrained every month using batch transforms. The ML team has set up a retraining pipeline using SageMaker Processing jobs and Step Functions. Recently, the Step Functions workflow has been failing at the retraining step with an error: 'AccessDeniedException: User: arn:aws:sts::123456789012:assumed-role/RetrainingRole/abc123 is not authorized to perform: s3:GetObject on resource: arn:aws:s3:::training-data/processed/latest.parquet'. The team confirms that the S3 bucket exists and the object is present. The retraining role has the following policy: { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "s3:GetObject", "s3:PutObject" ], "Resource": "arn:aws:s3:::training-data/*" } ] }. The team also verifies that the bucket policy does not explicitly deny access. What is the MOST likely cause of the AccessDenied error?

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.

Question 1easymultiple choice

Full question →

A
The Step Functions execution role does not have permission to invoke the SageMaker Processing job
Why wrong: The error is about the retraining role (assumed by the Processing job), not the Step Functions role. The error message specifically points to the retraining role.
B
The path in the error message is misspelled; the actual object is at a different key
Why wrong: If the path were incorrect, the error would be a 404 Not Found, not AccessDenied.
C
The S3 bucket has a bucket policy that denies access to the retraining role based on a condition like aws:SourceIp
Why wrong: The team verified that the bucket policy does not explicitly deny access, so this is unlikely.
D
The training data object uses server-side encryption with AWS KMS (SSE-KMS), and the retraining role lacks kms:Decrypt permission on the KMS key
If the object is encrypted with SSE-KMS, the role needs both s3:GetObject and kms:Decrypt. The current IAM policy does not include KMS permissions.

Full breakdown with real-world context →

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

✓

The training data object uses server-side encryption with AWS KMS (SSE-KMS), and the retraining role lacks kms:Decrypt permission on the KMS key

The error indicates that the retraining role is not authorized to GetObject on the specific object. Even though the policy allows 'arn:aws:s3:::training-data/*', if the object is encrypted with SSE-KMS, the role also needs kms:Decrypt permission on the KMS key. The bucket policy might also require encryption. Option B is the most likely cause. Option A (wrong region) would give a different error. Option C (lack of S3 bucket policy) is not the issue if there is no explicit deny. Option D (path typo) would result in a 404 Not Found error, not AccessDenied.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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 Step Functions execution role does not have permission to invoke the SageMaker Processing job
Why it's wrong here
The error is about the retraining role (assumed by the Processing job), not the Step Functions role. The error message specifically points to the retraining role.
✗
The path in the error message is misspelled; the actual object is at a different key
Why it's wrong here
If the path were incorrect, the error would be a 404 Not Found, not AccessDenied.
✗
The S3 bucket has a bucket policy that denies access to the retraining role based on a condition like aws:SourceIp
Why it's wrong here
The team verified that the bucket policy does not explicitly deny access, so this is unlikely.
✓
The training data object uses server-side encryption with AWS KMS (SSE-KMS), and the retraining role lacks kms:Decrypt permission on the KMS key
Why this is correct
If the object is encrypted with SSE-KMS, the role needs both s3:GetObject and kms:Decrypt. The current IAM policy does not include KMS permissions.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related MLA-C01 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this MLA-C01 question test?

ML Solution Monitoring, Maintenance and Security — This question tests ML Solution Monitoring, Maintenance and Security — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: The training data object uses server-side encryption with AWS KMS (SSE-KMS), and the retraining role lacks kms:Decrypt permission on the KMS key — The error indicates that the retraining role is not authorized to GetObject on the specific object. Even though the policy allows 'arn:aws:s3:::training-data/*', if the object is encrypted with SSE-KMS, the role also needs kms:Decrypt permission on the KMS key. The bucket policy might also require encryption. Option B is the most likely cause. Option A (wrong region) would give a different error. Option C (lack of S3 bucket policy) is not the issue if there is no explicit deny. Option D (path typo) would result in a 404 Not Found error, not AccessDenied.

What should I do if I get this MLA-C01 question wrong?

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?

Static NAT maps one inside address to one outside address.

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