- A
Deploy a single RDS DB instance in one Availability Zone.
Why wrong: Single instance is not resilient to AZ failure.
- B
Deploy an RDS DB instance with a cross-region read replica.
Why wrong: Cross-region read replica does not provide automatic failover for the primary.
- C
Deploy an RDS DB instance with a read replica in the same region.
Why wrong: Read replicas are for read scaling, not automatic failover.
- D
Deploy an RDS DB instance in a Multi-AZ configuration.
Multi-AZ provides automatic failover to a standby in another AZ.
Question 884 of 1,750
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 is building a multi-tier web application on AWS. The web tier runs on EC2 instances behind an ALB. The application tier runs on EC2 instances that are not publicly accessible. The database tier runs on RDS MySQL. Which design provides the HIGHEST level of resilience for the database tier?
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
✓
Deploy an RDS DB instance in a Multi-AZ configuration.
Option D is correct because Multi-AZ RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary DB instance fails, RDS automatically fails over to the standby, providing high availability with minimal downtime. This design ensures the database tier remains resilient against AZ-level failures without manual intervention.
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.
- ✗
Deploy a single RDS DB instance in one Availability Zone.
Why it's wrong here
Single instance is not resilient to AZ failure.
- ✗
Deploy an RDS DB instance with a cross-region read replica.
Why it's wrong here
Cross-region read replica does not provide automatic failover for the primary.
- ✗
Deploy an RDS DB instance with a read replica in the same region.
Why it's wrong here
Read replicas are for read scaling, not automatic failover.
- ✓
Deploy an RDS DB instance in a Multi-AZ configuration.
Why this is correct
Multi-AZ provides automatic failover to a standby in another AZ.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read replicas (which are for read scaling and disaster recovery) with Multi-AZ deployments (which are for high availability and automatic failover), leading them to choose a read replica option for resilience.
Detailed technical explanation
How to think about this question
RDS Multi-AZ uses synchronous replication to the standby instance, ensuring zero data loss during failover (within the constraints of the storage engine). The failover is automatic and typically completes within 1-2 minutes, with the DNS endpoint updated to point to the new primary. In contrast, read replicas use asynchronous replication, which can lag behind the primary and may result in data loss if promoted during a failure.
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
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Resilient Cloud Solutions — study guide chapter
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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: Deploy an RDS DB instance in a Multi-AZ configuration. — Option D is correct because Multi-AZ RDS automatically provisions and maintains a synchronous standby replica in a different Availability Zone. If the primary DB instance fails, RDS automatically fails over to the standby, providing high availability with minimal downtime. This design ensures the database tier remains resilient against AZ-level failures without manual intervention.
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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Last reviewed: Jul 4, 2026
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