DEA-C01 Data Store Management Practice Question
A company uses Amazon RDS for MySQL with Multi-AZ deployment. The primary instance fails, and automatic failover occurs. After failover, the data engineer notices that the new primary instance has a different DNS endpoint. Which TWO statements are true about this scenario? (Choose TWO.)
⚠ Common exam trap
Many candidates think the endpoint changes to the standby's endpoint (Option D) or that a manual DNS update is needed (Option B), when in fact the original endpoint remains the same and RDS handles the DNS update automatically via CNAME.
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 DNS CNAME record is updated to point to the new primary.
When Amazon RDS performs automatic failover in a Multi-AZ deployment, it updates the DNS CNAME record for the primary DB instance to point to the new primary (formerly the standby). This ensures that applications using the original endpoint are transparently redirected to the new primary without manual intervention.
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 instance is created in the same Availability Zone as the failed primary.
Why it's wrong here
Multi-AZ uses a different AZ.
- ✗
A manual DNS update is required to connect to the new primary.
Why it's wrong here
Failover is automatic.
- ✓
The DNS CNAME record is updated to point to the new primary.
Why this is correct
RDS updates the CNAME automatically.
- ✗
The endpoint changes to the standby instance's endpoint.
Why it's wrong here
The CNAME remains the same.
- ✓
The applications can continue using the same database endpoint.
Why this is correct
The CNAME remains unchanged.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-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 DEA-C01 exam.