ACS is a policy-driven access control system and an integration point for network access control and identity management.
The ACS 5.4 software runs on a dedicated Cisco 1121 Secure Access Control System (CSACS-1121) appliance or on a VMware server. However, ACS 5.4 continues to support the CSACS-1120 appliances that you have used for previous releases of ACS, which you can upgrade to ACS 5.4.
This release of ACS provides new and enhanced functionality. Throughout this document, CSACS-1121 refers to the appliance hardware, and ACS Server refers to the ACS software.
All links are interchangable