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Data Ingestion and Transformation →easyMultiple ChoiceObjective-mapped

DEA-C01 Data Ingestion and Transformation Practice Question

This DEA-C01 practice question tests your understanding of data ingestion and transformation. 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 company wants to migrate on-premises data to Amazon S3 using AWS DataSync. The data is stored on an NFS file server and the total volume is 50 TB. The network bandwidth between the on-premises data center and AWS is 1 Gbps (gigabit per second). What is the primary factor that will determine the total time required for the initial data transfer?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

A
The available network bandwidth between on-premises and AWS
With 50 TB and 1 Gbps, the theoretical minimum time is ~4.7 days; network bandwidth is the key constraint.
B
The number of S3 buckets used as the destination
Why wrong: Number of buckets does not affect transfer speed.
C
The average file size in the dataset
Why wrong: While very small files can impact performance due to overhead, the primary bottleneck is bandwidth.
D
The IOPS (I/O operations per second) of the on-premises NFS server
Why wrong: NFS servers can usually saturate a 1 Gbps link; IOPS is not the limiting factor.

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

✓

The available network bandwidth between on-premises and AWS

AWS DataSync transfers data over the network, so the primary constraint is the available bandwidth between the on-premises NFS server and AWS. With 50 TB of data and a 1 Gbps link, the theoretical minimum transfer time is approximately 50 TB * 8 / 1 Gbps = 400,000 seconds (~111 hours), but real-world throughput is lower due to protocol overhead, latency, and competing traffic. The network bandwidth directly dictates the maximum data transfer rate, making it the dominant factor for the initial transfer duration.

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.

✓
The available network bandwidth between on-premises and AWS
Why this is correct
With 50 TB and 1 Gbps, the theoretical minimum time is ~4.7 days; network bandwidth is the key constraint.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The number of S3 buckets used as the destination
Why it's wrong here
Number of buckets does not affect transfer speed.
✗
The average file size in the dataset
Why it's wrong here
While very small files can impact performance due to overhead, the primary bottleneck is bandwidth.
✗
The IOPS (I/O operations per second) of the on-premises NFS server
Why it's wrong here
NFS servers can usually saturate a 1 Gbps link; IOPS is not the limiting factor.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may focus on the NFS server's IOPS or file size, assuming storage performance is the bottleneck, but the question explicitly provides a 1 Gbps bandwidth figure, signaling that network throughput is the key limiting factor for the initial transfer.

Detailed technical explanation

How to think about this question

DataSync uses a purpose-built protocol that optimizes network utilization by striping data across multiple TCP connections and performing checksum validation in transit. In practice, a 1 Gbps link yields around 80-100 MB/s of usable throughput after TCP overhead and encryption, meaning a 50 TB transfer could take 5-7 days. Real-world scenarios often involve throttling by the on-premises NFS server or network congestion, but the bandwidth ceiling remains the primary constraint.

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.

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FAQ

Questions learners often ask

What does this DEA-C01 question test?

Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The available network bandwidth between on-premises and AWS — AWS DataSync transfers data over the network, so the primary constraint is the available bandwidth between the on-premises NFS server and AWS. With 50 TB of data and a 1 Gbps link, the theoretical minimum transfer time is approximately 50 TB * 8 / 1 Gbps = 400,000 seconds (~111 hours), but real-world throughput is lower due to protocol overhead, latency, and competing traffic. The network bandwidth directly dictates the maximum data transfer rate, making it the dominant factor for the initial transfer duration.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DEA-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 DEA-C01 exam.