ZT project implementation requires prioritization as part of the overall ZT project planning activities. One area to consider is prioritization based on risks, which means that the organization should identify and assess the potential threats, vulnerabilities, and impacts that could affect its assets, operations, and reputation, and prioritize the ZT initiatives that address the most critical and urgent risks. Prioritization based on risks helps to align the ZT project with the business objectives and needs, and optimize the use of resources and time. Reference​= Zero Trust Planning - Cloud Security Alliance, section “Scope, Priority, & Business Case” The Zero Trust Journey: 4 Phases of Implementation - SEI Blog, section “Second Phase: Assess” Planning for a Zero Trust Architecture: A Planning Guide for Federal …, section “Gap Analysis”

Network access control (NAC) typically operates at layer 2, the data link layer, of the open systems interconnection (OSI) model. The data link layer is responsible for transferring data between adjacent nodes on a network, such as switches and endpoints. NAC operates at this layer by inspecting and controlling the access of devices to the network based on their MAC addresses, device profiles, security posture, and compliance status. Reference​=​Certificate of Competence in Zero Trust (CCZT) - Cloud Security Alliance,​Zero Trust Training (ZTT) - Module 6: Micro-segmentation