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NIST 800-171 R-3.13.1

Protect Communications at Boundaries

Official citation: 3.13.1

Class: core · Severity: critical

Statement of the obligation — verify against source

3.13.1

What it means

Monitor, control, and protect communications at the external boundaries and key internal boundaries of your systems — using boundary devices such as firewalls, gateways, and proxies — so you can see and govern information entering and leaving, and segment sensitive areas inside.

Educational reference only — not legal advice. Consult a qualified assessor or attorney for binding compliance determinations.