SC-7(5) Deny by Default — Allow by Exception
Control enhancement of SC-7 Boundary Protection
Control
Deny network communications traffic by default and allow network communications traffic by exception [Assignment: Selection (one-or-more): at managed interfaces | for [sc-07.05_odp.02] ].
Discussion
Denying by default and allowing by exception applies to inbound and outbound network communications traffic. A deny-all, permit-by-exception network communications traffic policy ensures that only those system connections that are essential and approved are allowed. Deny by default, allow by exception also applies to a system that is connected to an external system.
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