1a Public subnet 1a NAT gateway Application Load Balancer Auto Scaling group Security group proxy Amazon RDS instance web Network Load Balancer Auto Scaling group Security group Auto Scaling group Security group Endpoints Amazon S3 Amazon CloudWatch Amazon SNS Client Network Load Balancer Endpoints Security group AWS Systems Manager NAT gateway proxy Amazon RDS instance web Private subnet 1c Public subnet 1c Internet gateway Amazon Route 53 app Auto Scaling group Security group app Endpoints Security group