Mapped to NIST 800-171 Requirement: 3.1.3
CMMC Assessment Objective: AC.L2-3.1.3[c]
What This Objective Means
This is the technical validation step. While previous objectives focused on defining and enforcing approved CUI flows, this one asks the assessor to look under the hood and verify that your systems are:
• Configured correctly
• Blocking unauthorized flows
• Only permitting what’s defined in your CUI flow policies
The assessment is about proving alignment between what your policy says and what your systems are doing.
Why It Matters
Many organizations have strong policies—but fail to implement them in actual system configurations. That leads to:
• Data moving across unsecured or unauthorized paths
• Inconsistencies between expected and actual behavior
• Gaps that can be exploited by insiders or attackers
This objective helps verify that your network and systems reflect your compliance plan.
How to Implement It
• Review firewall and routing configurations to ensure segmentation is enforced
• Examine proxy, reverse proxy, or secure gateway rules that manage file and application access
• Ensure endpoint devices are restricted from sending CUI to unauthorized destinations
• Verify that only whitelisted apps or services can transmit or receive CUI
• Periodically test configurations using vulnerability scans, traffic analysis, or simulated data flows
Evidence the Assessor Will Look For
• Screenshots or exports of:
◦ Firewall rules
◦ Routing tables
◦ Proxy filters
◦ DNS rules that control access to external services
• Logs or reports showing blocked unauthorized connections
• Network diagrams that match your system configuration
• System security plans (SSPs) that define and document flow controls
Common Gaps
• Network configurations that allow all outbound traffic by default
• Devices that can connect to public file-sharing platforms without restriction
• No enforcement of segmentation between internal zones
How Cuick Trac Helps
Cuick Trac enforces this requirement through:
• A hardened enclave architecture that controls all ingress and egress traffic
• Predefined system configurations aligned with CMMC and NIST flow control expectations
• Centralized logging of all permitted and denied data flows
• Configuration settings that can be exported for audit documentation
With Cuick Trac, flow controls are baked into the infrastructure—so you don’t have to build them from scratch.
Final CTA
A compliant data flow starts with secure system configurations.
Schedule a Cuick Trac demo to verify, enforce, and prove your CUI boundaries.