AWS Certified Advanced Networking Specialty Practice Exam

What is the benefit of using the same DNS after a Multi-AZ RDS failover?

1. The application will need to reconnect manually.

2. The DNS will point to the secondary database automatically.

3. It improves connection times significantly.

4. Security policies remain unchanged.

The correct answer is: The DNS will point to the secondary database automatically.

Using the same DNS after a Multi-AZ RDS failover is advantageous because it automatically directs application traffic to the new primary database instance without requiring manual intervention. When a failover occurs, Amazon RDS updates the DNS record to point to the secondary database instance that has been promoted to primary. This seamless transition allows applications to continue operating with minimal disruption, as they can use the same connection string. While improving connection times and maintaining security policies are important considerations in network architecture, they are not directly related to the benefit of utilizing the same DNS during a failover scenario. The automatic updating of the DNS allows for application connectivity to be preserved, thus enhancing the resilience of the system. The need for manual reconnection is avoided, which would otherwise complicate the failover process.