SC.L1-3.13.5—Public-Access System Separation
>Control Description
Implement subnetworks for publicly accessible system components that are physically or logically separated from internal networks.
>Cross-Framework Mappings
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What is your policy for separating public-facing systems from internal networks?
- •How do you implement and enforce network segmentation?
- •What is your process for approving new public-facing systems?
- •Who is responsible for ensuring proper network separation?
- •How do you verify that separation is effective?
Technical Implementation:
- •What network segmentation separates public-facing systems?
- •What DMZ or screened subnet architectures are implemented?
- •What VLANs or physical separation is used?
- •What access controls restrict traffic between public and internal networks?
- •What monitoring detects unauthorized connections between zones?
Evidence & Documentation:
- •What network diagrams show boundary protection architecture?
- •What firewall rule sets and configurations can you provide?
- •What encryption implementation documentation shows FIPS-validated crypto?
- •What key management procedures can you provide?
- •What network segmentation documentation shows proper separation?
- •What evidence shows cryptographic mechanisms protect CUI?
- •What configuration documentation shows security controls are properly implemented?
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