- 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.
Quick Answer
The answer is to 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 that specific key and only for that role. This is correct because securing SageMaker training jobs with KMS and VPC ensures that the decryption key is never exposed outside the network boundary; the VPC endpoint keeps all S3 and KMS traffic within the AWS network, while the tightly scoped IAM role enforces that only the training job’s principal can call kms:Decrypt on the customer-managed key. On the AWS Certified Machine Learning Engineer Associate MLA-C01 exam, this scenario tests your understanding of defense-in-depth for HIPAA workloads—combining network isolation with key-level IAM policies. A common trap is thinking a bucket policy alone suffices, but it cannot restrict which principal uses the key. Memory tip: “VPC + IAM = key locked in a room only the job can enter.”
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.
Option C is correct because using a VPC and configuring the training job to use a VPC with a VPC endpoint for S3 and KMS ensures data stays within the VPC. Also, the training role should have strict permissions to the KMS key. Option A (bucket policy) alone is not enough. Option B (use only private subnet) but still need S3 access. Option D (S3 access points) is not the primary security measure.
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.
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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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. — Option C is correct because using a VPC and configuring the training job to use a VPC with a VPC endpoint for S3 and KMS ensures data stays within the VPC. Also, the training role should have strict permissions to the KMS key. Option A (bucket policy) alone is not enough. Option B (use only private subnet) but still need S3 access. Option D (S3 access points) is not the primary security measure.
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.
About these practice questions
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Same concept, more angles
1 more ways this is tested on MLA-C01
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is using a SageMaker notebook instance to develop models. The security team requires that all data in the notebook be encrypted at rest and in transit, and that internet access be restricted. Which configuration meets these requirements?
hard- A.Use a notebook with internet access enabled but attach a security group that blocks all outbound traffic.
- B.Use a notebook with a public subnet and a network ACL that denies all inbound traffic.
- C.Use a VPC-only notebook with default AWS managed key for EBS encryption.
- ✓ D.Use a VPC-only notebook instance with a customer-managed KMS key and disable direct internet access.
Why D: Option A is correct because a VPC-only notebook with KMS encryption ensures data at rest is encrypted and no internet access. HTTPS is used for in-transit. Option B allows internet access via NAT. Option C does not encrypt at rest. Option D ignores VPC restrictions.
Last reviewed: Jun 23, 2026
This MLA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MLA-C01 exam.
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