The “moat around the castle” defense is the tried-and-true way to handle computer network security, to keep cyber attackers out.  “Flat” networks focus on providing reliable and fast connectivity for all devices on the network, while security efforts hone in on isolating external networks from internal networks. This traditional approach, however, no longer works to secure the modern enterprise’s complex web of interconnected digitized networks, or the cyber attackers with their ever-evolving tricks — which has led to high-profile breaches like the recent WannaCry ransomware attack.

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