AWS Certified SysOps Administrator – Associate (legacy) — Question 51

You are managing a legacy application Inside VPC with hard coded IP addresses in its configuration.
Which two mechanisms will allow the application to failover to new instances without the need for reconfiguration? (Choose two.)

Answer options

• A. Create an ELB to reroute traffic to a failover instance
• B. Create a secondary ENI that can be moved to a failover instance
• C. Use Route53 health checks to fail traffic over to a failover instance
• D. Assign a secondary private IP address to the primary ENIO that can be moved to a failover instance

Correct answer: B, D

Explanation

The correct answers are B and D because both methods allow for seamless failover without reconfiguring the application. Creating a secondary ENI (B) can be moved to a failover instance, while assigning a secondary private IP address (D) to the primary ENI allows it to be transferred as well. Options A and C rely on external routing mechanisms which do not eliminate the need for configuration changes in the legacy application.