SC-7(26)

Requirement

Prohibit the direct connection of a classified national security system to an external network without the use of [Assignment: organization-defined boundary protection device].

Discussion

A direct connection is a dedicated physical or virtual connection between two or more systems. Organizations typically do not have complete control over external networks, including the Internet. Boundary protection devices (e.g., firewalls, gateways, and routers) mediate communications and information flows between classified national security systems and external networks. In addition, approved boundary protection devices (typically managed interface or cross-domain systems) provide information flow enforcement from systems to external networks.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: System and communications protection policy; procedures addressing boundary protection; system design documentation; system hardware and software; system architecture; system configuration settings and associated documentation; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; system developer; organizational personnel with boundary protection responsibilities].

Test

[SELECT FROM: Mechanisms prohibiting the direct connection of classified national security systems to an external network].

ID	Assessment Objectives
SC-07(26)	the direct connection of classified national security system to an external network without the use of a <SC-07(26)_ODP boundary protection device> is prohibited.

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