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Cost and Performance Optimization →hardMultiple ChoiceObjective-mapped

SOA-C02 Cost and Performance Optimization Practice Question

This SOA-C02 practice question tests your understanding of cost and performance optimization. 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 company runs a critical application on EC2 instances in an Auto Scaling group behind an Application Load Balancer. The application requires very low latency and high availability. The SysOps administrator notices that the application experiences increased latency during traffic spikes even though the Auto Scaling group is scaling out. Which solution would MOST effectively reduce latency?

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

✓

Change the launch configuration to use a larger instance type with more CPU and memory.

Option A is correct because using a larger instance type with more CPU and memory directly addresses the root cause of increased latency during traffic spikes: the existing instances are resource-constrained under load. By provisioning instances with higher compute capacity, each instance can handle more requests per second, reducing queueing delays and per-request processing time. This is a more immediate and effective solution than scaling out alone, which adds instances but does not improve the performance of each individual instance.

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.

  • ✓

    Change the launch configuration to use a larger instance type with more CPU and memory.

    Why this is correct

    Larger instances can process more requests, reducing latency.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    Pre-warm the load balancer by contacting AWS Support.

    Why it's wrong here

    ALB automatically scales, pre-warming is not needed.

  • ✗

    Increase the Auto Scaling cooldown period.

    Why it's wrong here

    Longer cooldown delays scaling, increasing latency.

  • ✗

    Deploy the instances in multiple Availability Zones.

    Why it's wrong here

    Improves availability, but not directly latency during spikes.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may assume scaling out (adding more instances) always reduces latency, but the question explicitly states that scaling is already occurring yet latency persists, indicating a per-instance performance bottleneck that only a larger instance type can resolve.

Detailed technical explanation

How to think about this question

Under the hood, latency during traffic spikes often stems from CPU steal time or memory pressure on burstable instance types (e.g., T3/T4g) when CPU credits are exhausted. Choosing a larger instance type, such as moving from a t3.medium to a c5.xlarge, provides dedicated vCPUs and more memory, eliminating credit-based throttling. In real-world scenarios, this is a common optimization for latency-sensitive applications like real-time bidding or gaming servers, where scaling out alone cannot compensate for a single instance's inability to process requests quickly enough.

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

An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.

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 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: Change the launch configuration to use a larger instance type with more CPU and memory. — Option A is correct because using a larger instance type with more CPU and memory directly addresses the root cause of increased latency during traffic spikes: the existing instances are resource-constrained under load. By provisioning instances with higher compute capacity, each instance can handle more requests per second, reducing queueing delays and per-request processing time. This is a more immediate and effective solution than scaling out alone, which adds instances but does not improve the performance of each individual instance.

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

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

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 2026

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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.