https://www.theregister.co.uk/2018/10/26/infosec_holodeck_network/

A group of Italian researchers have developed a blueprint for a massive virtualized enterprise network to allow for large-scale security tests without ruining an IT manager's day.

The University of Rome team constructed a large-scale simulated enterprise environment where everything from public-facing servers to DMZ subnets and firewalled internal networks are virtualized together, linking everything from servers and network appliances to virty versions of Windows, Ubuntu Linux, and macOS endpoints.