- A
Configure the training job to run in a VPC with an S3 VPC endpoint and attach an IAM role that has kms:Decrypt permission only for the key and only for that role.
VPC endpoint keeps traffic in AWS network, and fine-grained IAM ensures only the job can decrypt.
- B
Place the training job in a private subnet and use a NAT gateway for S3 access.
Why wrong: NAT gateway allows outbound internet, which may be a security concern; better to use VPC endpoint.
- C
Configure the S3 bucket policy to allow only the SageMaker training role's ARN.
Why wrong: Bucket policy helps but does not restrict decryption key usage.
- D
Use S3 access points with a policy that restricts access to the training job's IP address.
Why wrong: IP-based restriction may not be feasible in VPC; access points are for managing access at scale.
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. 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 healthcare company is subject to HIPAA and uses SageMaker to train models on patient data. The data is stored in an S3 bucket with server-side encryption using a customer-managed KMS key. The training job uses a custom Docker container that needs to read the data. The security team is concerned about unauthorized access to the data during training. They want to ensure that only the specific training job can access the decryption key. The training runs in a VPC. What should they do?
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
Configure the training job to run in a VPC with an S3 VPC endpoint and attach an IAM role that has kms:Decrypt permission only for the key and only for that role.
The recommended approach is option A, which involves running the training job in a VPC with an S3 VPC endpoint. This keeps all traffic within the AWS network and avoids the public internet. Additionally, the IAM role assumed by the training job should be granted the kms:Decrypt permission specifically for the customer-managed KMS key, and the KMS key policy should restrict decryption to only that role. This layered security ensures that only the specific training job can access the decryption key and read the data. Option B is incorrect because a NAT gateway is used for internet access, not for S3 access within a VPC; an S3 VPC endpoint is more secure and does not require a NAT gateway. Option C is insufficient because a bucket policy alone controls S3 access but does not grant KMS decryption permissions; the training role still needs explicit kms:Decrypt access to the key. Option D is not appropriate because the training job runs in a VPC with a dynamic IP, and S3 access points do not control KMS decryption permissions.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the training job to run in a VPC with an S3 VPC endpoint and attach an IAM role that has kms:Decrypt permission only for the key and only for that role.
Why this is correct
VPC endpoint keeps traffic in AWS network, and fine-grained IAM ensures only the job can decrypt.
Related concept
CIDR notation defines the prefix length.
- ✗
Place the training job in a private subnet and use a NAT gateway for S3 access.
- ✗
Configure the S3 bucket policy to allow only the SageMaker training role's ARN.
Why it's wrong here
Bucket policy helps but does not restrict decryption key usage.
- ✗
Use S3 access points with a policy that restricts access to the training job's IP address.
Why it's wrong here
IP-based restriction may not be feasible in VPC; access points are for managing access at scale.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Visual reference
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related MLA-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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ML Solution Monitoring, Maintenance and Security — study guide chapter
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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 — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Configure the training job to run in a VPC with an S3 VPC endpoint and attach an IAM role that has kms:Decrypt permission only for the key and only for that role. — The recommended approach is option A, which involves running the training job in a VPC with an S3 VPC endpoint. This keeps all traffic within the AWS network and avoids the public internet. Additionally, the IAM role assumed by the training job should be granted the kms:Decrypt permission specifically for the customer-managed KMS key, and the KMS key policy should restrict decryption to only that role. This layered security ensures that only the specific training job can access the decryption key and read the data. Option B is incorrect because a NAT gateway is used for internet access, not for S3 access within a VPC; an S3 VPC endpoint is more secure and does not require a NAT gateway. Option C is insufficient because a bucket policy alone controls S3 access but does not grant KMS decryption permissions; the training role still needs explicit kms:Decrypt access to the key. Option D is not appropriate because the training job runs in a VPC with a dynamic IP, and S3 access points do not control KMS decryption permissions.
What should I do if I get this MLA-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related MLA-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 23, 2026
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