The idea of perimeter defense is as old as servers themselves — say the word and it conjures up images of ENIAC-sized machines buzzing in locked rooms, firewalls separating them from the outside world. Unless you work for the CIA, that’s likely not your reality.

Instead, the data you secure lives in the cloud, flowing through laptops and cellphones around the world. APIs connect in; emails go out. When information is everywhere, security must be everywhere, too, leaving those who remember real servers to wonder if there’s even such a thing as the perimeter anymore.