Network segmentation best practices for reducing risk and containing threats

This document advocates for network segmentation and microsegmentation as Zero Trust controls to prevent lateral movement and contain breaches, outlines key best practices (default-deny/least-privilege communication, microsegmentation, application-aware controls, isolation of high-value systems, and continuous validation), cites the 2013 Target breach as an example of poor segmentation, and positions ThreatLocker as a platform that enforces allowlisting and behavioral controls to stop post-compromise techniques.