Zero trust assumes that internal users, assets, and applications cannot be trusted by default, since perimeter defenses can be bypassed. In containerized environments, this is applied by creating granular microsegments and allowing only traffic tied to legitimate business processes. This limits the spread of malware or ransomware that evades perimeter controls. Traditionally, policies were enforced at the IP and port level for servers and virtual machines, which helped reduce the attack surface and contain threats, but containerized applications require even more precise controls.

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