- A
Create an Amazon Route 53 health check to update the DNS record.
Why wrong: RDS handles DNS changes automatically during failover.
- B
No additional step; RDS Multi-AZ handles automatic failover.
RDS Multi-AZ automatically fails over to the standby instance.
- C
Configure a read replica in another AZ.
Why wrong: Read replicas do not support automatic failover.
- D
Deploy the standby instance in a different VPC.
Why wrong: Multi-AZ uses the same VPC with different subnets.
Question 1,192 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 wants to ensure its RDS Multi-AZ deployment automatically fails over to a standby instance in a different Availability Zone. Which additional step is required?
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
✓
No additional step; RDS Multi-AZ handles automatic failover.
Amazon RDS Multi-AZ automatically handles failover to the standby instance in a different Availability Zone without any additional configuration. When the primary DB instance becomes unavailable, RDS automatically detects the failure and flips the DNS record to point to the standby instance, typically within 60–120 seconds. No manual intervention or extra services like Route 53 health checks are required for this built-in failover 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.
- ✗
Create an Amazon Route 53 health check to update the DNS record.
Why it's wrong here
RDS handles DNS changes automatically during failover.
- ✓
No additional step; RDS Multi-AZ handles automatic failover.
Why this is correct
RDS Multi-AZ automatically fails over to the standby instance.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a read replica in another AZ.
Why it's wrong here
Read replicas do not support automatic failover.
- ✗
Deploy the standby instance in a different VPC.
Why it's wrong here
Multi-AZ uses the same VPC with different subnets.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates overthink the need for external DNS management (like Route 53 health checks) or confuse read replicas with Multi-AZ standby instances, not realizing that RDS Multi-AZ is a fully managed, automatic failover solution that handles DNS updates internally.
Detailed technical explanation
How to think about this question
RDS Multi-AZ uses synchronous replication to the standby instance, ensuring zero data loss (committed transactions are written to both AZs before acknowledgment). The failover is triggered by a health check on the primary instance, and the DNS name is automatically updated to the standby's IP address, typically completing within 1–2 minutes. In a real-world scenario, if the primary instance's underlying hardware fails or the AZ experiences an outage, RDS automatically initiates failover without requiring any changes to application connection strings.
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.
Visual reference
Quick reference
Common DNS Record Types
| Record | Purpose | Example |
|---|---|---|
| A | IPv4 address mapping | example.com → 93.184.216.34 |
| AAAA | IPv6 address mapping | example.com → 2606:2800::1 |
| CNAME | Alias to another hostname | www → example.com |
| MX | Mail server for domain | example.com → mail.example.com (priority 10) |
| TXT | Text data (SPF, DKIM, verification) | v=spf1 include:_spf.example.com ~all |
| NS | Authoritative name servers | example.com NS ns1.example.com |
| PTR | Reverse DNS (IP → hostname) | 34.216.184.93.in-addr.arpa → example.com |
| SOA | Zone authority record | Primary NS, admin email, serial, TTL defaults |
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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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: No additional step; RDS Multi-AZ handles automatic failover. — Amazon RDS Multi-AZ automatically handles failover to the standby instance in a different Availability Zone without any additional configuration. When the primary DB instance becomes unavailable, RDS automatically detects the failure and flips the DNS record to point to the standby instance, typically within 60–120 seconds. No manual intervention or extra services like Route 53 health checks are required for this built-in failover mechanism.
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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