The first step is to build the network infrastructure in AWS. In this section, you will leverage AWS Quick Start to build a highly available (HA) and secure network infrastructure. Then, you will deploy an AWS Managed Microsoft Active Directory using the AWS Directory Service to simulate your on-premise DNS system. When you complete this section, you will successfully deploy the infrastructure architecture as follows:

AWS Quick Starts is a library containing pre-built architecture templates by AWS Solution Architects and Partners. AWS Quick Starts uses AWS CloudFormation as a building tool to create the architectures described in its templates.
AWS CloudFormation is AWS’s Infrastructure as Code (IaC) service that allows you to create infrastructure based on templates (written in YAML or JSON). Templates are uploaded to the CloudFormation service and automatically create the infrastructure described in the template.
AWS Directory Service is a tool that allows you to deploy an Active Directory directly on AWS Cloud to simplify management and provide end-user access to AWS services.