The answer is to configure the application to use the Aurora cluster endpoint for database connections. This is correct because the cluster endpoint is a read-write endpoint that automatically points to the current primary instance; after a failover, it seamlessly updates to the new writer, allowing the application to reconnect without any code changes. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of Aurora’s built-in failover mechanics versus common traps like the reader endpoint, which is read-only and cannot handle writes, or a read replica, which lacks automatic failover. A key memory tip is to think of the cluster endpoint as the “single source of truth” for writes—it always follows the leader, so your app never needs to know which instance is primary.
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. The application uses an Aurora MySQL database. Recently, the database experienced a failover, and the application started throwing connection errors. The DevOps engineer needs to make the application resilient to database failovers with minimal code changes. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the application to use the Aurora cluster endpoint for database connections
Using the Aurora cluster endpoint with a read-write endpoint that automatically points to the new writer after a failover ensures the application reconnects without code changes. Option A is wrong because the reader endpoint is for read-only. Option C is wrong because a read replica does not automatically failover. Option D is wrong because RDS proxy does not change the endpoint behavior.
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.
✓
Configure the application to use the Aurora cluster endpoint for database connections
Why this is correct
Cluster endpoint always points to the current writer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the application to use the Aurora reader endpoint for all queries
Why it's wrong here
Reader endpoint is read-only and will fail on write operations.
✗
Create a cross-Region read replica and configure the application to retry on failure
Why it's wrong here
Read replica is read-only and does not become the writer automatically.
✗
Use Amazon RDS Proxy with IAM authentication to handle connection pooling
Why it's wrong here
RDS Proxy does not change the endpoint; it still needs the correct endpoint.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 the application to use the Aurora cluster endpoint for database connections — Using the Aurora cluster endpoint with a read-write endpoint that automatically points to the new writer after a failover ensures the application reconnects without code changes. Option A is wrong because the reader endpoint is for read-only. Option C is wrong because a read replica does not automatically failover. Option D is wrong because RDS proxy does not change the endpoint behavior.
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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