The correct approach is to configure the application to use the RDS instance endpoint and implement retry logic for database connections. This works because the instance endpoint automatically resolves to the current primary after a failover, while the cluster endpoint is designed for read/write splitting and can introduce delays during DNS propagation. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of how Multi-AZ failover interacts with application-layer resilience—a common trap is assuming the cluster endpoint handles failover transparently, but it does not guarantee immediate reconnection without retries. RDS Proxy can further reduce connection churn by pooling and reusing connections across failovers, but the core requirement remains retry logic in the application code. Memory tip: think “Instance + Retry = Resilient” to remember that the instance endpoint paired with exponential backoff is the foundation for graceful failover handling.
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.
Exhibit
Which TWO actions should the DevOps engineer take to improve the resilience of the architecture? (Choose two.)
A company runs a multi-tier web application on AWS. The application consists of an Application Load Balancer, EC2 instances in an Auto Scaling group, and an Amazon RDS Multi-AZ DB instance. The application experiences intermittent failures when the RDS primary instance fails over to the standby. The engineer needs to ensure that the application handles failover gracefully without manual intervention.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon RDS Proxy to pool and reuse database connections, which reduces connection churn during failover.
Using a proxy like ProxySQL or configuring the application to use the RDS endpoint (which automatically points to the current primary) helps handle failover. Additionally, enabling RDS connection pooling or using Lambda to update the application can help, but the simplest is to use the instance endpoint with a retry mechanism.
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.
✗
Modify the application to use DNS caching with a TTL of 300 seconds to avoid stale DNS records.
Why it's wrong here
DNS caching can cause issues during failover if TTL is too long; a short TTL is better.
✗
Configure the Application Load Balancer to perform health checks on the RDS instance.
Why it's wrong here
ALB cannot health check RDS; it health checks targets like EC2.
✓
Use Amazon RDS Proxy to pool and reuse database connections, which reduces connection churn during failover.
Why this is correct
RDS Proxy helps maintain connections during failover and reduces load on the database.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Multi-AZ on the Auto Scaling group to ensure EC2 instances are in multiple AZs.
Why it's wrong here
Auto Scaling groups already support multiple AZs; enabling Multi-AZ is not a concept for EC2.
✓
Configure the application to use the RDS instance endpoint (not the cluster endpoint) and implement retry logic for database connections.
Why this is correct
Using the instance endpoint is fine if retry logic is implemented, but the cluster endpoint is recommended for Multi-AZ.
Clue confirmation
The clue word "primary" in the question point toward this answer.
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
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: Use Amazon RDS Proxy to pool and reuse database connections, which reduces connection churn during failover. — Using a proxy like ProxySQL or configuring the application to use the RDS endpoint (which automatically points to the current primary) helps handle failover. Additionally, enabling RDS connection pooling or using Lambda to update the application can help, but the simplest is to use the instance endpoint with a retry mechanism.
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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