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Question 94 of 1,740

Resilient Cloud Solutions →easyMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to migrate session state to Amazon ElastiCache for Redis with replication. This solution directly offloads session state from RDS to ElastiCache Redis, replacing disk-based database lookups with low-latency in-memory operations, which eliminates the CPU bottleneck on RDS during traffic spikes. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of stateless application design and the appropriate use of managed caching services; a common trap is choosing to scale RDS vertically or horizontally, which only postpones the bottleneck rather than removing session persistence from the database entirely. Remember that session state is ephemeral and should never live in a relational database—think “sessions in memory, data in RDS.” A useful memory tip: “Redis for sessions, RDS for transactions.”

DOP-C02 Resilient Cloud Solutions Practice Question

This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 web application on EC2 instances behind an Application Load Balancer (ALB). The application stores session state in an RDS MySQL database. During a recent spike in traffic, the database CPU utilization reached 100%, causing slow responses. To improve resilience, what should a DevOps engineer do?

Question 1easymultiple choice

Full question →

A
Migrate session state to Amazon ElastiCache for Memcached.
Why wrong: Memcached is stateless and suitable for caching, but Redis with replication is more resilient for session state.
B
Increase the RDS instance size and enable Multi-AZ deployment.
Why wrong: This addresses database capacity but does not offload session state; Multi-AZ improves availability but not performance under spike.
C
Migrate session state to Amazon ElastiCache for Redis with replication.
Redis provides a resilient, in-memory session store that offloads the database and can handle high traffic with replication.
D
Configure Auto Scaling groups for the EC2 instances based on CPU utilization.
Why wrong: Auto Scaling helps with compute capacity but does not resolve the database CPU bottleneck.

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

✓

Migrate session state to Amazon ElastiCache for Redis with replication.

Option C is correct because Amazon ElastiCache for Redis provides a low-latency, in-memory session store that offloads the database, improving resilience under load. Option A (scaling RDS) only addresses database capacity, not offloading session state. Option B (ElastiCache Memcached) is possible but Redis is more commonly used for session state with persistence and replication. Option D (Auto Scaling groups) does not address the database bottleneck.

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.

✗
Migrate session state to Amazon ElastiCache for Memcached.
Why it's wrong here
Memcached is stateless and suitable for caching, but Redis with replication is more resilient for session state.
✗
Increase the RDS instance size and enable Multi-AZ deployment.
Why it's wrong here
This addresses database capacity but does not offload session state; Multi-AZ improves availability but not performance under spike.
✓
Migrate session state to Amazon ElastiCache for Redis with replication.
Why this is correct
Redis provides a resilient, in-memory session store that offloads the database and can handle high traffic with replication.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure Auto Scaling groups for the EC2 instances based on CPU utilization.
Why it's wrong here
Auto Scaling helps with compute capacity but does not resolve the database CPU bottleneck.

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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

What to study next

Got this wrong? Here's your next step.

Identify which DOP-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.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Migrate session state to Amazon ElastiCache for Redis with replication. — Option C is correct because Amazon ElastiCache for Redis provides a low-latency, in-memory session store that offloads the database, improving resilience under load. Option A (scaling RDS) only addresses database capacity, not offloading session state. Option B (ElastiCache Memcached) is possible but Redis is more commonly used for session state with persistence and replication. Option D (Auto Scaling groups) does not address the database bottleneck.

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

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DOP-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 DOP-C02 exam.