- A
Setting up S3 Lifecycle policies to transition data to colder storage
Lifecycle policies manage cost.
- B
Using Provisioned IOPS for S3
Why wrong: Provisioned IOPS is for EBS, not S3.
- C
Partitioning data by date to improve query performance
Partitioning improves query efficiency.
- D
Using a single Availability Zone for data storage
Why wrong: S3 is regional, not AZ-specific.
- E
Encrypting data at rest using AWS KMS
Encryption is a security best practice.
Question 622 of 1,755
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which THREE considerations are important when designing a data lake on Amazon S3?
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
✓
Setting up S3 Lifecycle policies to transition data to colder storage
Option A is correct because S3 Lifecycle policies allow you to automatically transition objects to colder storage classes (e.g., S3 Standard-IA, S3 Glacier) based on age or other rules, reducing storage costs for infrequently accessed data in a data lake. This is a key design consideration for managing data lifecycle and cost efficiency at scale.
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.
- ✓
Setting up S3 Lifecycle policies to transition data to colder storage
Why this is correct
Lifecycle policies manage cost.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Using Provisioned IOPS for S3
Why it's wrong here
Provisioned IOPS is for EBS, not S3.
- ✓
Partitioning data by date to improve query performance
Why this is correct
Partitioning improves query efficiency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Using a single Availability Zone for data storage
Why it's wrong here
S3 is regional, not AZ-specific.
- ✓
Encrypting data at rest using AWS KMS
Why this is correct
Encryption is a security best practice.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse S3 with EBS features (like Provisioned IOPS) or overlook that S3 inherently provides multi-AZ durability, making single-AZ storage an anti-pattern for data lakes.
Detailed technical explanation
How to think about this question
S3 Lifecycle policies operate asynchronously and can transition objects to colder tiers like S3 Glacier Deep Archive (cost ~$0.00099/GB/month) after a specified number of days, but note that objects smaller than 128 KB are not eligible for transition to S3 Glacier or S3 Glacier Deep Archive. Partitioning by date (Option C) improves query performance in analytics engines like Amazon Athena or Spark by enabling partition pruning, which reduces the amount of data scanned per query. Encryption at rest using AWS KMS (Option E) ensures data confidentiality and compliance, with S3 supporting server-side encryption (SSE-KMS) that integrates with AWS CloudTrail for audit trails.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
- →
Data Engineering — study guide chapter
Learn the concepts, then practise the questions
- →
Data Engineering 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?
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Setting up S3 Lifecycle policies to transition data to colder storage — Option A is correct because S3 Lifecycle policies allow you to automatically transition objects to colder storage classes (e.g., S3 Standard-IA, S3 Glacier) based on age or other rules, reducing storage costs for infrequently accessed data in a data lake. This is a key design consideration for managing data lifecycle and cost efficiency at scale.
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.