- A
Configure Auto Scaling to add more instances during peak hours.
Auto Scaling adds capacity to handle increased load.
- B
Increase the ALB idle timeout.
Why wrong: Idle timeout does not affect latency.
- C
Implement Amazon ElastiCache to cache frequently accessed data.
Caching reduces database load and latency.
- D
Use larger EC2 instance types.
Why wrong: Larger instances help but are less cost-effective than scaling out.
- E
Enable EBS optimization on the instances.
Why wrong: EBS optimization improves disk I/O, not application latency.
Question 1,349 of 1,616
Two Actions to Reduce Latency: Auto Scaling and ElastiCache
This DVA-C02 practice question tests your understanding of development with aws services. 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 is running a web application on EC2 instances behind an Application Load Balancer. The application experiences high latency during peak hours. A developer needs to improve performance. Which TWO actions should the developer take? (Choose TWO.)
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
✓
Configure Auto Scaling to add more instances during peak hours.
Option A is correct because Auto Scaling allows the application to dynamically add EC2 instances during peak hours, distributing the load across more resources and reducing latency. Option C is correct because ElastiCache caches frequently accessed data in-memory, reducing the load on the backend database and speeding up response times for repeated queries.
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.
- ✓
Configure Auto Scaling to add more instances during peak hours.
Why this is correct
Auto Scaling adds capacity to handle increased load.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the ALB idle timeout.
Why it's wrong here
Idle timeout does not affect latency.
- ✓
Implement Amazon ElastiCache to cache frequently accessed data.
Why this is correct
Caching reduces database load and latency.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use larger EC2 instance types.
Why it's wrong here
Larger instances help but are less cost-effective than scaling out.
- ✗
Enable EBS optimization on the instances.
Why it's wrong here
EBS optimization improves disk I/O, not application latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse vertical scaling (larger instances) with horizontal scaling (Auto Scaling), or think that increasing timeouts or enabling EBS optimization will fix application-level latency issues.
Detailed technical explanation
How to think about this question
Auto Scaling works by using CloudWatch alarms to trigger scale-out events based on metrics like CPU utilization or request count per target, ensuring capacity matches demand. ElastiCache (e.g., Redis or Memcached) reduces latency by serving data from memory with sub-millisecond response times, offloading repeated read queries from the database. In a real-world scenario, combining Auto Scaling with ElastiCache can handle traffic spikes while maintaining consistent performance, as seen in e-commerce sites during flash sales.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure Auto Scaling to add more instances during peak hours. — Option A is correct because Auto Scaling allows the application to dynamically add EC2 instances during peak hours, distributing the load across more resources and reducing latency. Option C is correct because ElastiCache caches frequently accessed data in-memory, reducing the load on the backend database and speeding up response times for repeated queries.
What should I do if I get this DVA-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
This DVA-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 DVA-C02 exam.
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