Which is NOT a prerequisite for configuring a primary vault in AWS using AMIs?

To configure a primary vault in AWS using Amazon Machine Images (AMIs), certain prerequisites must be met to ensure proper functionality and security of the vault. The choice regarding employing a virtual firewall is not a prerequisite for this specific configuration process.

The configuration requires a CyberArk network environment to ensure that the vault operates within the appropriate settings and follows best practices for network architecture. Deploying the CyberArk Vault image is a fundamental step since it establishes the primary vault that will be used. Verifying that Security Groups allow required communications is essential to ensure that necessary traffic can flow to and from the vault, enabling it to function correctly within the AWS environment.

Employing a virtual firewall, while it may contribute to enhancing security, is not strictly required for configuring the primary vault itself. This aspect serves more as an additional layer of security that may be implemented based on specific organizational policies or security requirements, rather than being a mandated step in the configuration process. Thus, it correctly identifies this option as not being a prerequisite in the context of the setup for a primary vault using AMIs in AWS.