SC.L2-3.13.1 — Monitor and protect communications at boundaries
Monitor, control, and protect communications (i.e., information transmitted or received by organizational systems) at the external boundaries and key internal boundaries of organizational systems.
Verbatim NIST SP 800-171 Rev 2 requirement text (3.13.1).
How it's scored
5 points deducted from your SPRS score if unmet.
An open gap here is not POA&M-eligible (only 1-point requirements qualify under 32 CFR 170.21, with one narrow exception at SC.L2-3.13.11): it must be fully implemented before a Level 2 assessment can certify.
What an assessor checks: the 8 assessment objectives
NIST SP 800-171A determination statements, verbatim. A CMMC Level 2 assessor marks SC.L2-3.13.1 MET only when every applicable objective is satisfied — and examines evidence, not assertions.
| Objective | Determination statement |
|---|---|
| 3.13.1[a] | the external system boundary is defined. |
| 3.13.1[b] | key internal system boundaries are defined. |
| 3.13.1[c] | communications are monitored at the external system boundary. |
| 3.13.1[d] | communications are monitored at key internal boundaries. |
| 3.13.1[e] | communications are controlled at the external system boundary. |
| 3.13.1[f] | communications are controlled at key internal boundaries. |
| 3.13.1[g] | communications are protected at the external system boundary. |
| 3.13.1[h] | communications are protected at key internal boundaries. |
Where do you stand on SC.L2-3.13.1?
The free Muster Score walks all 110 requirements — including every objective above — and computes your exact SPRS score in your browser. No signup, no upload, and your answers never leave your device.
Get your free Muster Score →Requirement and objective text: NIST SP 800-171 Rev 2 / SP 800-171A (verbatim). Scoring: DoD Assessment Methodology v1.2.1; POA&M eligibility: 32 CFR 170.21. Muster is independent and not affiliated with the U.S. Department of Defense or the Cyber AB; this page is compliance information, not legal advice or a certification.