This approach consists of steps that are taken to fully migrate to the cloud. At first, proper connectivity is established between customer data center and AWS – either thru VPN or (if possible) thru Direct Connect. In case application requires very low latency connectivity, We always advice to choose Direct Connect between Client Data Center and AWS. During this approach We move some components to AWS while ensuring they have connectivity with on premise services. Let’s say You want to migrate Your intranet site that authenticates users thru Microsoft Active Directory but You are not yet ready to move AD. This way You can leave AD servers on premise and move intranet site to AWS.