Resilience engineering is the practice of designing networks (and other things like airplanes) such that any failures are gracefully handled. But how do you know that your engineering efforts are successful? You can start with network emulators, where you can learn a lot about how your network is currently configured and what the tests do. But ultimately, there’s really only one way: with real-world testing.
When I say “real-world testing,” I mean that you really have to turn off parts of the network and see if the applications properly fail over to the redundant infrastructure.
