AC-4(20)—Approved Solutions
>Control Description
Employ ⚙organization-defined solutions in approved configurations to control the flow of ⚙organization-defined information across security domains.
>Cross-Framework Mappings
>Supplemental Guidance
Organizations define approved solutions and configurations in cross-domain policies and guidance in accordance with the types of information flows across classification boundaries. The National Security Agency (NSA) National Cross Domain Strategy and Management Office provides a listing of approved cross-domain solutions. Contact ncdsmo@nsa.gov for more information.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What formal policies and procedures govern the implementation of AC-4(20) (Approved Solutions)?
- •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-4(20)?
- •How frequently is the AC-4(20) policy reviewed and updated, and what triggers policy changes?
- •What training or awareness programs ensure personnel understand their responsibilities related to AC-4(20)?
Technical Implementation:
- •Describe the specific technical mechanisms or controls used to enforce AC-4(20) requirements.
- •What automated tools, systems, or technologies are deployed to implement AC-4(20)?
- •How is AC-4(20) integrated into your system architecture and overall security posture?
- •What configuration settings, parameters, or technical specifications enforce AC-4(20) requirements?
Evidence & Documentation:
- •What documentation demonstrates the complete implementation of AC-4(20)?
- •What audit logs, records, reports, or monitoring data validate AC-4(20) compliance?
- •Can you provide evidence of periodic reviews, assessments, or testing of AC-4(20) effectiveness?
- •What artifacts would you present during a FedRAMP assessment to demonstrate AC-4(20) compliance?
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