Frost & Sullivan does not view NAC as a market of point devices or licenses that are sold and easily counted. Instead Frost & Sullivan views NAC as a solution framework that enables organizations to: 1) Protect the endpoint 2) Compare endpoints against a predefined organizational policy before allowing those endpoints on the network, 3) Provide some form of remediation should an endpoint be seen as out of compliance and 4) Provide continued policy enforcement the entire time the endpoint is on the network. Large vendors such as Microsoft and Cisco are leading the charge in this approach with their Network Admission Control and Network Access Protocol frameworks respectively, however other vendors have had success with appliances.