AWS Certified Advanced Networking – Specialty (ANS-C00) — Question 26

Your organization leverages an IP Address Management (IPAM) product to manage IP address distribution. The IPAM exposes an API. Development teams use
CloudFormation to provision approved reference architectures. At deployment time, IP addresses must be allocated to the VPC. When the VPC is deleted, the
IPAM must reclaim the VPC's IP allocation.
Which method allows for efficient, automated integration of the IPAM with CloudFormation?

Answer options

• A. AWS CloudFormation parameters using the ג€Ref::ג€ intrinsic function
• B. AWS CloudFormation custom resource using an AWS Lambda invocation.
• C. CloudFormation::OpsWorks::Stack with custom Chef configuration.
• D. AWS CloudFormation parameters using the ג€Fn::FindInMapג€ intrinsic function.

Correct answer: B

Explanation

The correct answer is B because using an AWS CloudFormation custom resource with an AWS Lambda invocation allows for dynamic interaction with the IPAM API, enabling automated IP address allocation and reclamation. Options A and D only provide static references without the capability for real-time interaction with the API, while option C is unrelated to IP address management and does not fit the requirement.