SC-7(28)—Boundary Protection | Connections to Public Networks
IL5
IL6
>Control Description
Prohibit the direct connection of ⚙organization-defined system to a public network.
>DoD Impact Level Requirements
No specific parameter values or requirements for this impact level.
>Discussion
A direct connection is a dedicated physical or virtual connection between two or more systems. A public network is a network accessible to the public, including the Internet and organizational extranets with public access.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What policies govern the implementation of connections to public networks?
- •How are system and communications protection requirements defined and maintained?
- •Who is responsible for configuring and maintaining the security controls specified in SC-7(28)?
Technical Implementation:
- •How is connections to public networks technically implemented in your environment?
- •What systems, tools, or configurations enforce this protection requirement?
- •How do you ensure that connections to public networks remains effective as the system evolves?
- •What network boundary protections are in place (firewalls, gateways, etc.)?
Evidence & Documentation:
- •What documentation demonstrates the implementation of SC-7(28)?
- •Can you provide configuration evidence or system diagrams showing this protection control?
- •What logs or monitoring data verify that this control is functioning correctly?
- •Can you provide network architecture diagrams and firewall rulesets?
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