Cisco Trust Agent (CTA)

A program installed on a client computer that allows it to communicate with other Cisco NAC components

OfficeScan client computer

A computer with the OfficeScan client program installed. To work with Cisco NAC, the OfficeScan client computer also requires the Cisco Trust Agent.

Network Access Device

A network device that supports Cisco NAC functionality. Supported Network Access Devices include a range of Cisco routers, firewalls, and access points, as well as third-party devices with Terminal Access Controller Access Control System (TACACS+) or the Remote Dial-In User Service (RADIUS) protocol.

For a list of supported devices, see Supported Platforms and Requirements.

Cisco Secure Access Control Server (ACS)

A server that receives OfficeScan client antivirus data from the client through the Network Access Device and passes it to an external user database for evaluation. Later in the process, the ACS server also passes the result of the evaluation, which may include instructions for the OfficeScan client, to the Network Access Device.

Policy Server

A program that receives and evaluates OfficeScan client antivirus data. After performing the evaluation, the Policy Server determines the actions the OfficeScan client should carry out and then notifies the OfficeScan client to perform the actions.

OfficeScan server

Reports the current Virus Pattern and Virus Scan Engine versions to the Policy Server, which uses this information to evaluate the OfficeScan client’s antivirus status.