The document outlines Zero Trust Network Access (ZTNA) as a modern security approach that replaces traditional trusted networking models. It emphasizes the need for organizations to implement ZTNA to enhance security while enabling flexible access to applications for employees and partners, predicting that a significant shift from traditional VPNs will occur by 2023. Recommendations for security leaders include conducting pilot ZTNA projects, replacing legacy VPN models, and ensuring robust user and device authentication to mitigate risks associated with excessive trust granted in traditional access methods.