what is a NAC
With Cisco NAC Appliance (formerly Cisco Clean Access), use your organization's network infrastructure to enforce security policy compliance on all devices that attempt to gain access. Best of all, this Network Admission Control (NAC) product is easy to deploy.he Cisco Network Admission Control System, composed of the Cisco NAC Manager and Server, is a policy component of the Cisco TrustSec solution. You can deploy this system as an overlay solution for accounts requiring network authentication, role-based access control, and posture assessment.