← SOA-C02·Amazon Web Services

Question 1,324 of 1,546

Cost and Performance Optimization →mediumMultiple ChoiceObjective-mapped

SOA-C02 Cost and Performance Optimization Practice Question

This SOA-C02 practice question tests your understanding of cost and performance optimization. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 runs a data analytics platform on AWS that processes large datasets using Amazon EMR. The EMR cluster consists of 1 master node (m5.xlarge) and 10 core nodes (r5.2xlarge). The cluster runs batch jobs that last 4 hours each, and the cluster is terminated after each job. The SysOps administrator notices that the cluster takes 15 minutes to provision and bootstrap before each job, which increases the total runtime and cost. The administrator wants to reduce the time and cost associated with cluster provisioning. The data is stored in Amazon S3, and the job scripts are stored in an S3 bucket. The administrator has considered using long-running clusters but is concerned about cost. Which approach should the administrator take to optimize both time and cost?

A
Switch the core nodes to Spot Instances to reduce costs.
Why wrong: Spot Instances reduce cost but do not address provisioning time.
B
Use EMR Managed Scaling and keep the cluster running between jobs.
Managed scaling reduces idle cost and eliminates provisioning time.
C
Use a larger master node instance type to speed up bootstrapping.
Why wrong: Larger master node does not significantly reduce provisioning time.
D
Use Amazon FSx for Lustre as the data store to reduce I/O time.
Why wrong: This increases complexity and does not reduce provisioning time.

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

✓

Use EMR Managed Scaling and keep the cluster running between jobs.

Option B is correct because using EMR Managed Scaling with a long-running cluster eliminates the 15-minute provisioning time for each job, as the cluster remains active. Managed Scaling automatically adjusts the number of core nodes based on workload demand, minimizing idle costs by scaling down when not in use. Option A is wrong because Spot Instances reduce cost but do not address provisioning time. Option C is wrong because a larger master node does not speed up bootstrapping; bootstrapping time is dominated by installing software and configurations on all nodes. Option D is wrong because Amazon FSx for Lustre is a high-performance file system that can improve I/O but does not reduce provisioning time and adds unnecessary cost and complexity.

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.

✗
Switch the core nodes to Spot Instances to reduce costs.
Why it's wrong here
Spot Instances reduce cost but do not address provisioning time.
✓
Use EMR Managed Scaling and keep the cluster running between jobs.
Why this is correct
Managed scaling reduces idle cost and eliminates provisioning time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a larger master node instance type to speed up bootstrapping.
Why it's wrong here
Larger master node does not significantly reduce provisioning time.
✗
Use Amazon FSx for Lustre as the data store to reduce I/O time.
Why it's wrong here
This increases complexity and does not reduce provisioning time.

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.

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 SOA-C02 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.

Related SOA-C02 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Monitoring, Logging, and Remediation practice questions

Practise SOA-C02 questions linked to Monitoring, Logging, and Remediation.

Reliability and Business Continuity practice questions

Practise SOA-C02 questions linked to Reliability and Business Continuity.

Deployment, Provisioning, and Automation practice questions

Practise SOA-C02 questions linked to Deployment, Provisioning, and Automation.

Security and Compliance practice questions

Practise SOA-C02 questions linked to Security and Compliance.

Networking and Content Delivery practice questions

Practise SOA-C02 questions linked to Networking and Content Delivery.

Cost and Performance Optimization practice questions

Practise SOA-C02 questions linked to Cost and Performance Optimization.

SOA-C02 fundamentals practice questions

Practise SOA-C02 questions linked to SOA-C02 fundamentals.

SOA-C02 scenario practice questions

Practise SOA-C02 questions linked to SOA-C02 scenario.

SOA-C02 troubleshooting practice questions

Practise SOA-C02 questions linked to SOA-C02 troubleshooting.

Practice this exam

Start a free SOA-C02 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

SOA-C02 practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this SOA-C02 question test?

Cost and Performance Optimization — This question tests Cost and Performance Optimization — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use EMR Managed Scaling and keep the cluster running between jobs. — Option B is correct because using EMR Managed Scaling with a long-running cluster eliminates the 15-minute provisioning time for each job, as the cluster remains active. Managed Scaling automatically adjusts the number of core nodes based on workload demand, minimizing idle costs by scaling down when not in use. Option A is wrong because Spot Instances reduce cost but do not address provisioning time. Option C is wrong because a larger master node does not speed up bootstrapping; bootstrapping time is dominated by installing software and configurations on all nodes. Option D is wrong because Amazon FSx for Lustre is a high-performance file system that can improve I/O but does not reduce provisioning time and adds unnecessary cost and complexity.

What should I do if I get this SOA-C02 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →

How Courseiva writes practice questions · Editorial policy

Keep practising

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

This SOA-C02 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 SOA-C02 exam.