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Answer: Adjust the database tier's RDS security group to accept traffic from the web tier's security group.
The issue is that the web tier's EC2 instances cannot communicate with the database tier's RDS instance. By default, the security groups for the RDS instance do not allow traffic from the EC2 instances. Adding an inbound rule to the security group of the RDS instance that allows traffic from the web tier's security group will resolve the connectivity problem. Option D is the correct answer.
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In a VPC with a two-tier web application, the web tier on public subnets and the private database tier are unable to communicate despite correct configurations. What action should a solutions architect take to resolve the connectivity issue?
A
Modify the private subnet's network ACL to permit traffic from the web tier's EC2 instances.
B
Update the VPC route table for traffic between the web and database tiers.
C
Place the web and database tiers in separate VPCs and set up VPC peering.
D
Adjust the database tier's RDS security group to accept traffic from the web tier's security group.
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