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NIST 800-171 Rev 2
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03.13.06: Boundary Protection – Deny by Default – Allow by Exception
Boundary Protection – Deny by Default – Allow by Exception
03.13.06: Boundary Protection – Deny by Default – Allow by Exception

Deny network communications traffic by default and allow network communications traffic by exception (i.e., deny all, permit by exception).


Not applicable - Not applicable
Planned - The implementation is planned
In progress - The implementation is currently in progress
Partially implemented - The control is partially implemented
Implemented - The control is fully implemented
Alternative implementation - There is an alternative implementation in place (e.g., shared responsibility or inherited implementation)
Description

This requirement applies to inbound and outbound network communications traffic at the system boundary and at identified points within the system. A deny-all, permit-by-exception network communications traffic policy ensures that only those connections which are essential and approved are allowed.