DBS-C01 Deployment and Migration Practice Question
A company is deploying a new web application that uses Amazon RDS for MySQL. The application must be highly available across three Availability Zones with automatic failover. Which deployment configuration should be used?
⚠ Common exam trap
Watch out — candidates often confuse Amazon RDS for MySQL Multi-AZ with true multi-AZ high availability across three AZs, not realizing that Multi-AZ only covers two AZs, while Aurora is the only MySQL-compatible option that supports three AZs with automatic failover.
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 Amazon Aurora MySQL with three Aurora Replicas in different Availability Zones.
Amazon Aurora MySQL is the correct choice because it is designed for high availability across three Availability Zones by default, with six copies of data across three AZs and the ability to create up to 15 Aurora Replicas. The requirement for automatic failover across three AZs is met by deploying three Aurora Replicas in different AZs, ensuring continuous availability even if two AZs fail. Standard Amazon RDS for MySQL Multi-AZ only supports a single standby in one other AZ, not three AZs.
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 Amazon RDS for MySQL in a Single-AZ configuration and use an Application Load Balancer.
Why it's wrong here
Single-AZ does not provide automatic failover; ALB is for web traffic, not database failover.
- ✓
Deploy Amazon Aurora MySQL with three Aurora Replicas in different Availability Zones.
Why this is correct
Aurora with Replicas provides automatic failover and high availability across multiple AZs.
- ✗
Deploy Amazon RDS for MySQL with Multi-AZ and a standby instance in a different Availability Zone.
Why it's wrong here
Multi-AZ provides automatic failover but only across two AZs, not three.
- ✗
Deploy Amazon RDS for MySQL with Read Replicas in two additional Availability Zones.
Why it's wrong here
Read Replicas are for read scaling, not automatic failover.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-C01 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 DBS-C01 exam.