CiscoSecure ACS supports TACACS+ and RADIUS independently or at the same time, and can use the Windows NT user database to enable a single login.

CiscoSecure ACS can be installed on the NT primary domain controller (PDC), backup domain controller (BDC), or a standalone server.

CiscoSecure ACS 2.1 supports the leading authentication protocols: PAP, CHAP, AppleTalk Remote Access (ARAP), Token card servers, Windows NT user database, and Novell NDS.

It also has a callback feature for added security.