The answer is to create a second Auto Scaling group in the secondary region and use Route 53 failover routing to direct traffic to the healthy region, because this architecture leverages Global Datastore for Redis to provide cross-region disaster recovery with minimal data loss. Global Datastore for Redis enables fully managed, active-passive cross-region replication, allowing you to promote the secondary cluster to primary in under a minute, which satisfies the 15-minute RTO while keeping the RPO at roughly 5 minutes due to asynchronous replication. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of combining ElastiCache’s Global Datastore with Route 53 health checks and multi-region compute—a common trap is forgetting to provision the secondary Auto Scaling group or assuming that simply enabling replication alone handles traffic redirection. Memory tip: think “Global Datastore + Route 53 failover = regional survival in under 15 minutes.”
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Exhibit
Which THREE steps should the team take to meet these requirements? (Choose three.)
A gaming company runs a real-time multiplayer game on AWS using Amazon EC2 instances in an Auto Scaling group behind a Network Load Balancer. The game state is stored in Amazon ElastiCache for Redis. The team needs to ensure that the architecture can survive a regional failure with minimal data loss and recovery time. The RTO is 15 minutes and RPO is 5 minutes. The game currently uses a single Redis cluster in us-east-1.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure Amazon ElastiCache for Redis with Global Datastore to replicate data to a second region.
To survive regional failure, you need cross-region replication for Redis. Global Datastore for Redis provides cross-region replication. Also, you need to be able to promote the replica in the secondary region. Finally, you need to redirect traffic to the secondary region, which can be done with Route 53 failover routing.
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.
✗
Enable Multi-AZ on the ElastiCache cluster to improve availability within the region.
Why it's wrong here
Multi-AZ is within region; not sufficient for regional failure.
✗
Use Amazon ElastiCache for Redis with cluster mode disabled to simplify failover.
Why it's wrong here
Cluster mode disabled doesn't help with cross-region; Global Datastore requires cluster mode enabled.
✓
Configure Amazon ElastiCache for Redis with Global Datastore to replicate data to a second region.
Why this is correct
Global Datastore provides cross-region replication with <5-minute RPO.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the application to write to the local Redis replica in the secondary region and then sync back.
Why it's wrong here
Application-level dual writes increase complexity and may cause consistency issues.
✓
Create a second Auto Scaling group in the secondary region and use Route 53 failover routing to direct traffic to the healthy region.
Why this is correct
Failover routing automatically switches traffic when health checks fail.
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.
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: Configure Amazon ElastiCache for Redis with Global Datastore to replicate data to a second region. — To survive regional failure, you need cross-region replication for Redis. Global Datastore for Redis provides cross-region replication. Also, you need to be able to promote the replica in the secondary region. Finally, you need to redirect traffic to the secondary region, which can be done with Route 53 failover routing.
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.
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Question Discussion
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