Essential NSX-T entities are created and configured automatically after you prepare your VMs for NSX.
The following is the list of these configurations:
A logical port is created for this VM.
The VM is assigned an overlay IP address (if you chose to set the mode to overlay).
The VM is marked as NSX managed.
The VM is reported as part of the inventory in NSX Manager to achieve, for example, micro-segmentation on logical constructs.
East-West traffic is enabled for this VM.