AC-4(7)—One-Way Flow Mechanisms
>Control Description
Enforce one-way information flows through hardware-based flow control mechanisms.
>Supplemental Guidance
One-way flow mechanisms may also be referred to as a unidirectional network, unidirectional security gateway, or data diode. One-way flow mechanisms can be used to prevent data from being exported from a higher impact or classified domain or system while permitting data from a lower impact or unclassified domain or system to be imported.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What formal policies and procedures govern the implementation of AC-4(7) (One-Way Flow Mechanisms)?
- •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-4(7)?
- •How frequently is the AC-4(7) policy reviewed and updated, and what triggers policy changes?
- •What training or awareness programs ensure personnel understand their responsibilities related to AC-4(7)?
Technical Implementation:
- •Describe the specific technical mechanisms or controls used to enforce AC-4(7) requirements.
- •What automated tools, systems, or technologies are deployed to implement AC-4(7)?
- •How is AC-4(7) integrated into your system architecture and overall security posture?
- •What configuration settings, parameters, or technical specifications enforce AC-4(7) requirements?
Evidence & Documentation:
- •What documentation demonstrates the complete implementation of AC-4(7)?
- •What audit logs, records, reports, or monitoring data validate AC-4(7) compliance?
- •Can you provide evidence of periodic reviews, assessments, or testing of AC-4(7) effectiveness?
- •What artifacts would you present during a FedRAMP assessment to demonstrate AC-4(7) compliance?
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