This chapter was designed to give you an overview of the infrastructure and to help guide you through some of the many choices you will need to make to determine your PKI requirements and to create a design before installing any software. The primary reason for this choice of layout is to help you configure the environment correctly the first time, as some settings can affect Active Directory as a whole and are not easily undone. For more complex deployments and detailed best practices, refer to the white papers in the Additional Reading section.