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Data Operations and Support →easyMultiple ChoiceObjective-mapped

DEA-C01 Data Operations and Support Practice Question

This DEA-C01 practice question tests your understanding of data operations and support. 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 data engineer is monitoring an Amazon EMR cluster and notices that the cluster is running out of disk space on the core nodes. Which action can be taken to resolve this issue?

A
Reduce the retention period of data stored on HDFS
Why wrong: May not be acceptable and doesn't add capacity.
B
Change the core node instance type to a compute-optimized type
Why wrong: Compute-optimized types may have less disk.
C
Increase the EBS volume size attached to core nodes
More EBS capacity directly adds disk space.
D
Use Spot Instances for core nodes
Why wrong: Spot Instances are cheaper but do not increase disk.

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

✓

Increase the EBS volume size attached to core nodes

Option C is correct because increasing the EBS volume size attached to core nodes directly adds storage capacity, resolving the disk space issue. Option A is wrong because reducing HDFS data retention may free space but does not increase available disk space; it could result in data loss. Option B is wrong because changing to a compute-optimized instance type affects CPU and memory, not storage. Option D is wrong because Spot Instances are a pricing model and do not add disk space.

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.

✗
Reduce the retention period of data stored on HDFS
Why it's wrong here
May not be acceptable and doesn't add capacity.
✗
Change the core node instance type to a compute-optimized type
Why it's wrong here
Compute-optimized types may have less disk.
✓
Increase the EBS volume size attached to core nodes
Why this is correct
More EBS capacity directly adds disk space.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Spot Instances for core nodes
Why it's wrong here
Spot Instances are cheaper but do not increase disk.

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.

Visual reference

What to study next

Got this wrong? Here's your next step.

Identify which DEA-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 DEA-C01 question test?

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

What is the correct answer to this question?

The correct answer is: Increase the EBS volume size attached to core nodes — Option C is correct because increasing the EBS volume size attached to core nodes directly adds storage capacity, resolving the disk space issue. Option A is wrong because reducing HDFS data retention may free space but does not increase available disk space; it could result in data loss. Option B is wrong because changing to a compute-optimized instance type affects CPU and memory, not storage. Option D is wrong because Spot Instances are a pricing model and do not add disk space.

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

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.