- A
Use S3 server-side encryption with S3-managed keys (SSE-S3)
Why wrong: SSE-S3 uses AWS-managed keys, not customer HSM.
- B
Use client-side encryption with the encryption key stored in the HSM
Why wrong: Client-side encryption adds complexity and is not integrated with S3 server-side.
- C
Use S3 server-side encryption with customer-provided keys (SSE-C) and store the keys in the HSM
SSE-C allows customers to provide their own keys, which can be stored in an HSM.
- D
Use S3 server-side encryption with AWS KMS managed keys (SSE-KMS) with a customer managed key
Why wrong: KMS is a software key store, not an HSM.
Question 906 of 1,755
MLS-C01 Practice Question: Machine Learning Implementation and Operations
This MLS-C01 practice question tests your understanding of machine learning implementation and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company uses Amazon SageMaker to train a text classification model. The training data is stored in S3 and contains sensitive personally identifiable information (PII). The company must ensure that the data is encrypted at rest in S3 and that the encryption key is managed by the company's own hardware security module (HSM). Which configuration should be used?
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
✓
Use S3 server-side encryption with customer-provided keys (SSE-C) and store the keys in the HSM
Option C is correct because SSE-C allows you to provide your own encryption key, which can be stored in your own HSM, and Amazon S3 manages the encryption/decryption process using that key. This satisfies the requirement for server-side encryption with a key managed by the company's HSM, ensuring data at rest is encrypted without exposing the key to AWS.
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.
- ✗
Use S3 server-side encryption with S3-managed keys (SSE-S3)
Why it's wrong here
SSE-S3 uses AWS-managed keys, not customer HSM.
- ✗
Use client-side encryption with the encryption key stored in the HSM
Why it's wrong here
Client-side encryption adds complexity and is not integrated with S3 server-side.
- ✓
Use S3 server-side encryption with customer-provided keys (SSE-C) and store the keys in the HSM
Why this is correct
SSE-C allows customers to provide their own keys, which can be stored in an HSM.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use S3 server-side encryption with AWS KMS managed keys (SSE-KMS) with a customer managed key
Why it's wrong here
KMS is a software key store, not an HSM.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse SSE-KMS with customer managed keys as meeting the 'customer-managed' requirement, but the question specifically requires the key to be managed by the company's own HSM, not by AWS KMS, which still stores the key in AWS's infrastructure.
Detailed technical explanation
How to think about this question
SSE-C works by having the client provide a base64-encoded 256-bit AES key with each PUT request; S3 uses this key to encrypt the object and discards the key after encryption, storing only a salted HMAC of the key for integrity. The key must be provided again for GET requests, which means the HSM must be accessible to supply the key on demand, adding operational complexity. In practice, this is often used for regulatory compliance where key material must never leave the customer's HSM boundary, such as in financial or healthcare environments.
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.
TExam Day Tips
- 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Machine Learning Implementation and Operations — study guide chapter
Learn the concepts, then practise the questions
- →
Machine Learning Implementation and Operations practice questions
Targeted practice on this topic area only
- →
All MLS-C01 questions
1,755 questions across all exam domains
- →
AWS Certified Machine Learning Specialty MLS-C01 study guide
Full concept coverage aligned to exam objectives
- →
MLS-C01 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related MLS-C01 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Data Engineering practice questions
Practise MLS-C01 questions linked to Data Engineering.
Machine Learning Implementation and Operations practice questions
Practise MLS-C01 questions linked to Machine Learning Implementation and Operations.
Modeling practice questions
Practise MLS-C01 questions linked to Modeling.
Exploratory Data Analysis practice questions
Practise MLS-C01 questions linked to Exploratory Data Analysis.
MLS-C01 fundamentals practice questions
Practise MLS-C01 questions linked to MLS-C01 fundamentals.
MLS-C01 scenario practice questions
Practise MLS-C01 questions linked to MLS-C01 scenario.
MLS-C01 troubleshooting practice questions
Practise MLS-C01 questions linked to MLS-C01 troubleshooting.
Practice this exam
Start a free MLS-C01 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this MLS-C01 question test?
Machine Learning Implementation and Operations — This question tests Machine Learning Implementation and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use S3 server-side encryption with customer-provided keys (SSE-C) and store the keys in the HSM — Option C is correct because SSE-C allows you to provide your own encryption key, which can be stored in your own HSM, and Amazon S3 manages the encryption/decryption process using that key. This satisfies the requirement for server-side encryption with a key managed by the company's HSM, ensuring data at rest is encrypted without exposing the key to AWS.
What should I do if I get this MLS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More MLS-C01 practice questions
- A company needs to transfer 10 TB of data from an on-premises data center to Amazon S3. The network bandwidth is limited…
- A company is using Amazon Kinesis Data Streams to ingest real-time clickstream data. The data is consumed by a Lambda fu…
- A team is building a data pipeline to process terabytes of log data daily using Amazon EMR. The data arrives in 5-minute…
- A data science team is building a real-time fraud detection system. Transactions are streamed via Amazon Kinesis Data St…
- A company uses Amazon SageMaker to train and deploy machine learning models. The training data is stored in Amazon S3 (P…
- A data engineering team is designing a data lake on AWS for machine learning workloads. The data includes structured, se…
Last reviewed: Jul 4, 2026
This MLS-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 MLS-C01 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.