DOP-C02 Resilient Cloud Solutions Practice Question
A company uses Amazon RDS Multi-AZ for disaster recovery. The primary DB instance in us-east-1a fails. What happens next?
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 standby DB instance in us-east-1b is promoted automatically and the CNAME record is updated
RDS Multi-AZ automatically fails over to the standby in a different Availability Zone within minutes. The CNAME record is updated to point to the standby DB instance, so no manual intervention is needed. Option A is correct because this automatic failover and CNAME update occurs. Option B is wrong because no manual promotion is required. Option C is wrong because the primary is not rebuilt in the same AZ; it fails over to a standby in a different AZ. Option D is wrong because read replicas are not used for Multi-AZ failover; a standby instance is promoted.
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 standby DB instance in us-east-1b is promoted automatically and the CNAME record is updated
Why this is correct
RDS Multi-AZ performs automatic failover.
- ✗
The administrator must manually promote the standby instance
Why it's wrong here
Multi-AZ is automatic; no manual promotion needed.
- ✗
The primary instance is automatically rebuilt in the same AZ
Why it's wrong here
Multi-AZ fails over to a different AZ, not the same.
- ✗
A read replica in us-east-1b is automatically promoted to primary
Why it's wrong here
Read replicas are for read scaling, not automatic failover.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.