AWS DevOps Engineer - Professional

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QuestionQ27

Resilient Cloud Solutions

A DevOps engineer is building an AWS CloudFormation template to deploy a web service. The web service will run on Amazon EC2 instances in a private subnet behind an Application Load Balancer (ALB). The DevOps engineer must ensure that the service can receive requests from clients that use IPv6 addresses.

What should the DevOps engineer do in the CloudFormation template to allow IPv6 clients to access the web service?

Explanation

A dualstack Application Load Balancer accepts client connections over both IPv4 and IPv6 and provides an AAAA DNS record for IPv6 clients. The VPC and subnets selected for that ALB must have IPv6 CIDR blocks. The ALB may communicate with private EC2 targets through an IPv4 target group, so assigning IPv6 addresses to those instances is not required solely for IPv6 client access.

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