DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 microservices application on Amazon ECS with Fargate. The application includes a service that processes orders and stores them in an RDS PostgreSQL database. The company wants to ensure that the order service is resilient to AZ failures and can handle a sudden increase in order volume. Which TWO actions should the DevOps engineer take? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy the RDS instance in a Multi-AZ configuration.
Option C is correct because deploying the RDS instance in a Multi-AZ configuration provides automatic failover to a standby replica in a different Availability Zone, ensuring database resilience to AZ failures. Option D is correct because configuring the ECS service to run tasks in multiple Availability Zones distributes the order processing workload across AZs, improving both fault tolerance and scalability during sudden traffic spikes.
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.
✗
Increase the CPU and memory limits for the ECS task definition.
Why it's wrong here
Increasing limits does not provide automatic scaling for sudden volume.
✗
Place an Amazon CloudFront distribution in front of the order service.
Why it's wrong here
CloudFront is for static content and does not improve backend resilience.
✓
Deploy the RDS instance in a Multi-AZ configuration.
Why this is correct
Multi-AZ RDS provides automatic failover to a standby in another AZ.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure the ECS service to run tasks in multiple Availability Zones.
Why this is correct
Multi-AZ task placement ensures that if one AZ fails, tasks in other AZs continue.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use RDS Proxy to manage database connections.
Why it's wrong here
RDS Proxy improves connection efficiency but does not provide AZ resilience.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse connection pooling (RDS Proxy) with high availability (Multi-AZ) or assume that vertical scaling (increasing task limits) is sufficient for both resilience and sudden load, when in fact horizontal distribution across AZs is required for fault tolerance and elasticity.
Detailed technical explanation
How to think about this question
Multi-AZ RDS uses synchronous replication to a standby instance in a different AZ, with automatic failover typically completing within 1-2 minutes; this ensures data durability and availability without manual intervention. ECS services with Fargate can spread tasks across multiple AZs using a spread strategy or binpack placement, and when combined with an Application Load Balancer, traffic is automatically routed away from unhealthy tasks or AZs, enabling seamless scaling during demand spikes.
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.
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: Deploy the RDS instance in a Multi-AZ configuration. — Option C is correct because deploying the RDS instance in a Multi-AZ configuration provides automatic failover to a standby replica in a different Availability Zone, ensuring database resilience to AZ failures. Option D is correct because configuring the ECS service to run tasks in multiple Availability Zones distributes the order processing workload across AZs, improving both fault tolerance and scalability during sudden traffic spikes.
What should I do if I get this DOP-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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Question Discussion
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