The answer is the available network bandwidth between on-premises and AWS, as it is the primary factor affecting AWS DataSync transfer time for a 50 TB dataset over a 1 Gbps link. Even with full utilization, the raw throughput limit of 1 Gbps means the transfer will take approximately 4.7 days, making bandwidth the definitive bottleneck. This concept tests your understanding that while DataSync optimizes parallel transfers and handles large files efficiently, the physical network pipe size dictates the minimum transfer duration. On the DEA-C01 exam, this appears as a classic scenario where candidates mistakenly focus on NFS server performance or S3 ingestion limits, but the correct trap to avoid is forgetting that bandwidth is the slowest link in the chain. A useful memory tip: think of bandwidth as the “gatekeeper” for bulk transfers—no matter how fast the source or destination, the network speed sets the clock.
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.
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
Option C is correct because the network bandwidth is the bottleneck for transferring 50 TB over a 1 Gbps link; it will take approximately 4.7 days to transfer if bandwidth is fully utilized, but file metadata operations and number of files also matter. Option A is wrong because DataSync can handle large files efficiently. Option B is wrong because the NFS server performance is usually not the bottleneck compared to network. Option D is wrong because S3 object storage can accept data at high throughput.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The available network bandwidth between on-premises and AWS — Option C is correct because the network bandwidth is the bottleneck for transferring 50 TB over a 1 Gbps link; it will take approximately 4.7 days to transfer if bandwidth is fully utilized, but file metadata operations and number of files also matter. Option A is wrong because DataSync can handle large files efficiently. Option B is wrong because the NFS server performance is usually not the bottleneck compared to network. Option D is wrong because S3 object storage can accept data at high throughput.
What should I do if I get this DEA-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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