Cisco Network Admission Control (NAC) solution allows network administrators to authenticate, authorize, evaluate, and remediate wired, wireless, and remote users and their machines prior to allowing users onto the network. It identifies whether networked devices such as laptops, desktops, and other corporate assets are compliant with an organization's security policies, and it repairs vulnerabilities before permitting access to the network.Cisco NAC Server initiates assessment and enforces access privileges based on endpoint compliance. Users are blocked at the port layer and restricted from accessing the trusted network until they successfully pass inspection.