The correct actions are using Route 53 health checks for DNS failover to a secondary region and deploying a warm standby with an RDS MySQL read replica in that secondary region. Route 53 health checks monitor the ALB endpoint in the primary region; when they detect a failure, DNS automatically routes traffic to the secondary region’s infrastructure, enabling fast failover. The read replica in the secondary region can be promoted to a primary database quickly, providing a warm standby that avoids the single-region limitation of Multi-AZ deployments. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding that Multi-AZ RDS is region-bound and cannot survive a regional outage, while a cross-region read replica is the correct DR pattern. A common trap is assuming a single ALB or Auto Scaling group can span regions—they cannot. Remember the mnemonic “Health + Replica = Regional Escape” to link Route 53 health checks with cross-region read replicas for multi-region disaster recovery.
DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. 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 DevOps engineer is designing an incident response plan for a multi-region application. The application runs on EC2 instances behind an Application Load Balancer (ALB) and uses Amazon RDS for MySQL with Multi-AZ. Which TWO actions should the engineer include to ensure high availability and fast failover during a regional incident?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up an Amazon RDS read replica in a second region and promote it during failover.
Options B and D are correct. B is correct because using Route 53 with health checks on the ALB endpoint can route traffic away from an unhealthy region. D is correct because a warm standby with a read replica in another region allows for promoting the replica to primary quickly. Option A is wrong because a Multi-AZ RDS instance is in a single region. Option C is wrong because a single ALB cannot span regions. Option E is wrong because Auto Scaling groups are per-region, not cross-region.
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.
✓
Set up an Amazon RDS read replica in a second region and promote it during failover.
Why this is correct
Read replica can be promoted to primary in another region.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create an Auto Scaling group that can launch instances in multiple regions.
Why it's wrong here
Auto Scaling groups are region-specific; use multiple groups.
✗
Deploy an Application Load Balancer that spans both regions.
Why it's wrong here
ALB is regional; cannot span regions.
✗
Configure Amazon RDS Multi-AZ in a second region.
Why it's wrong here
Multi-AZ is within one region; for cross-region, use read replicas.
✓
Use Amazon Route 53 with health checks to fail over DNS to a secondary region.
Why this is correct
Route 53 can route traffic based on health of regional endpoints.
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
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.
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.
Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up an Amazon RDS read replica in a second region and promote it during failover. — Options B and D are correct. B is correct because using Route 53 with health checks on the ALB endpoint can route traffic away from an unhealthy region. D is correct because a warm standby with a read replica in another region allows for promoting the replica to primary quickly. Option A is wrong because a Multi-AZ RDS instance is in a single region. Option C is wrong because a single ALB cannot span regions. Option E is wrong because Auto Scaling groups are per-region, not cross-region.
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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