- A
Implement a blue/green deployment strategy using a separate Redis cluster for the new version.
Isolates the new version's impact; if memory leak occurs, only the green cluster is affected.
- B
Increase the ElastiCache node type to a larger instance size.
Why wrong: Larger instance may delay but not prevent out-of-memory; it's a workaround, not a solution.
- C
Disable cluster mode on the Redis cluster to reduce overhead.
Why wrong: Disabling cluster mode reduces scalability and does not prevent memory leaks.
- D
Take a manual snapshot of the Redis cluster before each deployment.
Why wrong: Snapshots protect data but do not prevent the deployment from causing memory issues.
- E
Configure Amazon CloudWatch alarms on Redis memory usage and evictions to trigger an automatic rollback.
Alarms can detect memory issues early and trigger rollback of the deployment.
Quick Answer
The correct answer is to use a blue/green deployment with a separate Redis cluster for the new version, paired with CloudWatch alarms on Redis memory usage and evictions to trigger an automatic rollback. This approach isolates the risk of a memory leak by routing traffic to a fresh, isolated ElastiCache cluster during the deployment, ensuring that any memory leak in the new application version cannot corrupt the existing production data or cause evictions. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of safe deployment strategies and proactive monitoring—specifically how blue/green deployments decouple compute and stateful layers to prevent cascading failures. A common trap is choosing to simply resize the Redis cluster, which only masks the symptom rather than preventing the leak from impacting users. Remember the mnemonic: "Blue/Green, separate the scene; CloudWatch alarms keep the farm from harm."
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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 company runs a web application on EC2 instances in an Auto Scaling group across three Availability Zones. The application uses an Application Load Balancer (ALB) and stores session data in an ElastiCache for Redis cluster with cluster mode enabled. During a recent deployment, a new version of the application caused a memory leak in the Redis cluster, leading to out-of-memory errors and evictions. The DevOps team wants to prevent future deployments from affecting the Redis cluster's health. What should the team do? (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
Implement a blue/green deployment strategy using a separate Redis cluster for the new version.
Option A is correct because using a blue/green deployment with a separate Redis cluster for the new version isolates the risk. Option E is correct because enabling CloudWatch alarms on Redis memory usage and evictions can trigger automatic rollback or alerting. Option B (increasing instance size) treats the symptom, not the cause. Option C (snapshot before deployment) is good for backup but doesn't prevent impact. Option D (cluster mode disabled) reduces scalability.
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.
- ✓
Implement a blue/green deployment strategy using a separate Redis cluster for the new version.
Why this is correct
Isolates the new version's impact; if memory leak occurs, only the green cluster is affected.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the ElastiCache node type to a larger instance size.
Why it's wrong here
Larger instance may delay but not prevent out-of-memory; it's a workaround, not a solution.
- ✗
Disable cluster mode on the Redis cluster to reduce overhead.
Why it's wrong here
Disabling cluster mode reduces scalability and does not prevent memory leaks.
- ✗
Take a manual snapshot of the Redis cluster before each deployment.
Why it's wrong here
Snapshots protect data but do not prevent the deployment from causing memory issues.
- ✓
Configure Amazon CloudWatch alarms on Redis memory usage and evictions to trigger an automatic rollback.
Why this is correct
Alarms can detect memory issues early and trigger rollback of the deployment.
Related concept
Read the scenario before looking for a memorised answer.
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
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 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: Implement a blue/green deployment strategy using a separate Redis cluster for the new version. — Option A is correct because using a blue/green deployment with a separate Redis cluster for the new version isolates the risk. Option E is correct because enabling CloudWatch alarms on Redis memory usage and evictions can trigger automatic rollback or alerting. Option B (increasing instance size) treats the symptom, not the cause. Option C (snapshot before deployment) is good for backup but doesn't prevent impact. Option D (cluster mode disabled) reduces scalability.
What should I do if I get this DOP-C02 question wrong?
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 20, 2026
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.
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