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MLS-C01 Data Engineering Practice Question

This MLS-C01 practice question tests your understanding of data engineering. 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.

A company needs to move 50 TB of data from an on-premises data center to Amazon S3. The company has a limited internet bandwidth of 100 Mbps. The data transfer must be completed within 10 days. Which TWO services should the company use together to meet these requirements?

A
Amazon S3 as the destination
Data is ultimately stored in S3.
B
AWS Direct Connect
Why wrong: Direct Connect requires physical setup and does not solve the bandwidth limitation.
C
AWS Site-to-Site VPN
Why wrong: VPN relies on the same limited internet bandwidth.
D
AWS Snowball Edge
Snowball is designed for large data transfers over physical media.
E
AWS DataSync over the internet
Why wrong: DataSync over 100 Mbps would exceed the 10-day window.

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

✓

Amazon S3 as the destination

The correct answers are A (Amazon S3 as the destination) and D (AWS Snowball Edge). The company needs to transfer 50 TB within 10 days, but with only 100 Mbps bandwidth, only about 10.8 TB can be transferred over the internet in that time. Therefore, a physical transfer solution like AWS Snowball Edge is required to move the data offline to S3. Option B (AWS Direct Connect) is incorrect because even though it provides a dedicated connection, it still requires time to provision and would not be able to transfer 50 TB within 10 days if the bandwidth is limited to 100 Mbps (or even higher, Snowball is more practical for such large data). Option C (AWS Site-to-Site VPN) is incorrect because it also uses the internet and is subject to the same bandwidth limitations. Option E (AWS DataSync over the internet) is incorrect because it is also limited by the 100 Mbps bandwidth and cannot complete the transfer within 10 days.

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.

✓
Amazon S3 as the destination
Why this is correct
Data is ultimately stored in S3.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Direct Connect
Why it's wrong here
Direct Connect requires physical setup and does not solve the bandwidth limitation.
✗
AWS Site-to-Site VPN
Why it's wrong here
VPN relies on the same limited internet bandwidth.
✓
AWS Snowball Edge
Why this is correct
Snowball is designed for large data transfers over physical media.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS DataSync over the internet
Why it's wrong here
DataSync over 100 Mbps would exceed the 10-day window.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
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 MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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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: Amazon S3 as the destination — The correct answers are A (Amazon S3 as the destination) and D (AWS Snowball Edge). The company needs to transfer 50 TB within 10 days, but with only 100 Mbps bandwidth, only about 10.8 TB can be transferred over the internet in that time. Therefore, a physical transfer solution like AWS Snowball Edge is required to move the data offline to S3. Option B (AWS Direct Connect) is incorrect because even though it provides a dedicated connection, it still requires time to provision and would not be able to transfer 50 TB within 10 days if the bandwidth is limited to 100 Mbps (or even higher, Snowball is more practical for such large data). Option C (AWS Site-to-Site VPN) is incorrect because it also uses the internet and is subject to the same bandwidth limitations. Option E (AWS DataSync over the internet) is incorrect because it is also limited by the 100 Mbps bandwidth and cannot complete the transfer within 10 days.

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

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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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.