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Resilient Cloud Solutions →hardMultiple ChoiceObjective-mapped

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 uses AWS CloudFormation to deploy a multi-tier application. The stack includes an RDS DB instance with Multi-AZ enabled. The database experiences a failover during maintenance. The application reports connection errors for several minutes. What is the MOST likely cause and solution?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The RDS failover took longer than expected; increase the Multi-AZ timeout
Why wrong: Multi-AZ failover time is typically short and cannot be increased.
B
The read replica was promoted incorrectly; recreate the read replica
Why wrong: Multi-AZ does not use read replicas.
C
The RDS proxy is misconfigured; disable the proxy for Multi-AZ
Why wrong: RDS proxy actually helps with connection pooling but still requires retry logic.
D
The application does not implement connection retry logic; implement exponential backoff and retry
Without retry, the application fails to reconnect after DNS changes.

Full breakdown with real-world context →

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

✓

The application does not implement connection retry logic; implement exponential backoff and retry

The correct answer is D. The application experiences connection errors during an RDS Multi-AZ failover because it does not implement connection retry logic. The failover typically completes within 60 seconds, but any active connections are dropped. Without retry logic, the application fails to reconnect. Implementing exponential backoff and retry allows the application to handle transient failures. Option A is wrong because there is no configurable Multi-AZ timeout; failover time is not adjustable. Option B is wrong because Multi-AZ uses a standby instance, not a read replica; read replicas are for read scaling. Option C is wrong because an RDS proxy does not eliminate the need for retry logic; misconfiguration is not the primary issue.

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.

✗
The RDS failover took longer than expected; increase the Multi-AZ timeout
Why it's wrong here
Multi-AZ failover time is typically short and cannot be increased.
✗
The read replica was promoted incorrectly; recreate the read replica
Why it's wrong here
Multi-AZ does not use read replicas.
✗
The RDS proxy is misconfigured; disable the proxy for Multi-AZ
Why it's wrong here
RDS proxy actually helps with connection pooling but still requires retry logic.
✓
The application does not implement connection retry logic; implement exponential backoff and retry
Why this is correct
Without retry, the application fails to reconnect after DNS changes.
Clue confirmation
The clue word "most likely" 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.

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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: The application does not implement connection retry logic; implement exponential backoff and retry — The correct answer is D. The application experiences connection errors during an RDS Multi-AZ failover because it does not implement connection retry logic. The failover typically completes within 60 seconds, but any active connections are dropped. Without retry logic, the application fails to reconnect. Implementing exponential backoff and retry allows the application to handle transient failures. Option A is wrong because there is no configurable Multi-AZ timeout; failover time is not adjustable. Option B is wrong because Multi-AZ uses a standby instance, not a read replica; read replicas are for read scaling. Option C is wrong because an RDS proxy does not eliminate the need for retry logic; misconfiguration is not the primary issue.

What should I do if I get this DOP-C02 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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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.