About Cisco NAC Appliance
 Cisco NAC Appliance is a Network Admission Control (NAC) product that 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 corporate assets are compliant with a network's security policies, and it repairs any vulnerabilities before permitting access to the network.
 
 Cisco NAC Appliance is a network-centric integrated solution administered from the web console of the Clean Access Manager (CAM), enforced through the Clean Access Server (CAS), and applied on clients through the Cisco NAC Agent and Cisco NAC Web Agent client software. You can deploy the Cisco NAC Appliance solution in the configuration that best meets the needs of your network.
 
 FIPS 140-2 Compliant and Non-FIPS Hardware Platforms
 FIPS 140-2 compliant and non-FIPS Cisco NAC Appliance hardware platforms are Linux-based network hardware appliances which are pre-installed with either the CAM or CAS application, the operating system, and all relevant components on a dedicated server machine. In Release 4.7(0) and later, the operating system comprises a hardened Linux kernel based on CentOS 5.3. Cisco NAC Appliance does not support the installation of any other packages or applications onto a CAM or CAS dedicated machine.
 
 Cisco NAC Appliance Release 4.9 only support and can only be installed on the following Cisco NAC Appliance platforms:
 
 Cisco NAC-3355 Front and Rear Panels
 The Cisco NAC-3355 FIPS 140-2 compliant platform provides enhanced capability for enterprise wide Clean Access Standard Manager and Clean Access Server (1500/2500/3500 user count) deployments. A NAC-3355 Standard CAM can manage up to 20 Clean Access Servers or 20 HA-CAS pairs. A NAC-3355 CAS can support up to 1500, 2500, or 3500 users.
 
 Similar to the Cisco NAC-3315, the Cisco NAC-3355 comes equipped with 4 network interfaces to provide flexibility in NIC interface selection and facilitate CAS high availability configuration. The Cisco NAC-3355 additionally provides 2 GB of RAM, two SAS drives configured in RAID 0 and 1, dual power supplies, and an SSL accelerator card to support large network deployments and provide added reliability for a centralized CAM/CAS deployment in the network core.