Network Security Control (NSC)
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The PCI DSS v4.x term for any technology that enforces network policy between segments, replacing the v3.2.1 wording "firewalls and routers". It covers traditional firewalls but also cloud security groups, virtual network appliances and container network policy, which is the point of the change: Requirement 1 applies to whatever enforces the policy, not only to a physical appliance.