Definition - What does Inverted Network mean?
An inverted network is a network security philosophy that focuses on the core of an enterprise network rather than the perimeter. Where traditional network security revolves around firewalls and intrusion detection systems that prevent threats from the outside world, an inverted network philosophy is concerned about inside threats, and so focuses more on techniques like encryption.
Techopedia explains Inverted Network
Another way of thinking about an inverted network is to throw out the idea that nodes within the LAN are safe. It's not just about letting the bad guys in, but making sure that threats internally are dealt with.