Historically, the focus of network access control (NAC) has been Authentication, Authorization, and Accounting (AAA). At its core, NAC enables mobility and dynamic security. However, the enterprise network no longer sits within four secure walls. It extends to wherever employees and data travel. Mobility, digitization, and the IoT are changing the way organizations operate. Networks are expanding, resulting in increased complexity of resource management and disparate security solutions. The Information Technology (IT)/Operational Technology (OT) convergence adds more complexity and more devices. In this report, we will see how certain NAC vendors are tailoring their architectures and solutions to address the specific use case of IT and OT convergence. NAC vendors are working on delivering broader and deeper OT visibility and control.