The answer is mounting an Amazon FSx for Lustre file system integrated with the S3 bucket. This solution provides the fastest and most cost-effective data access because FSx for Lustre is a fully managed, high-performance file system designed for workloads requiring sub-millisecond latencies and massive throughput, and its native S3 integration allows training jobs to read data directly from the file system without incurring S3 GET request latency. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this scenario tests your understanding of optimizing data ingestion for distributed training—a common trap is confusing network improvements like Cluster Placement Groups or Elastic Fabric Adapter, which address inter-node communication, with the actual bottleneck of slow S3 reads. Remember the key distinction: for large datasets accessed repeatedly, a Lustre file system acts as a high-speed cache, while S3 Transfer Acceleration only helps uploads, not reads. Memory tip: “Lustre for latency, not for uploads.”
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.
A data science team uses Amazon SageMaker to train models on a dataset stored in Amazon S3. The dataset is 2 TB and is accessed by multiple training jobs. The team notices that training jobs are slow due to high S3 GET request latency. Which solution would provide the fastest and most cost-effective data access?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Mount an Amazon FSx for Lustre file system integrated with the S3 bucket
Using Amazon FSx for Lustre as a managed Lustre file system with S3 integration provides high-throughput, low-latency access for training jobs. Option A (Cluster Placement Group) reduces network latency but does not improve S3 access. Option B (Elastic Fabric Adapter) improves inter-node communication, not data access from S3. Option D (S3 Transfer Acceleration) improves upload speed, not GET latency for large datasets.
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.
✗
Place all training instances in a Cluster Placement Group
Why it's wrong here
Placement groups reduce network latency between instances but do not affect S3 access latency.
✗
Enable S3 Transfer Acceleration on the bucket
Why it's wrong here
S3 Transfer Acceleration is for fast uploads over long distances, not for improving GET latency for training.
✓
Mount an Amazon FSx for Lustre file system integrated with the S3 bucket
Why this is correct
FSx for Lustre provides a high-performance file system that can read data from S3 with low latency.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Elastic Fabric Adapter (EFA) for training instances
Why it's wrong here
EFA improves inter-instance communication for distributed training, not data access from S3.
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 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.
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.
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: Mount an Amazon FSx for Lustre file system integrated with the S3 bucket — Using Amazon FSx for Lustre as a managed Lustre file system with S3 integration provides high-throughput, low-latency access for training jobs. Option A (Cluster Placement Group) reduces network latency but does not improve S3 access. Option B (Elastic Fabric Adapter) improves inter-node communication, not data access from S3. Option D (S3 Transfer Acceleration) improves upload speed, not GET latency for large datasets.
What should I do if I get this MLS-C01 question wrong?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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