Tacacs server in Cisco

If I am not wrong , In Cisco they use Tacacs server as well as Radius server  as centralized authentication database .
Radius server can be installed on windows server or other OS. However I am not sure if Tacacs server is installed on Windows or linux or on cisco router .

any explanation will be very much appreciated.

Thanks
jskfanAsked:
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Matt MinorTechnical Systems AnalystCommented:
TACACS(+) and RADIUS are two different types of authentication protocols- both of which would be installed and configured on a central server (Windows or otherwise).

TACACS was originally developed to control access to UNIX devices. Cisco developed TACACS+ for use as an Authentication, Authorization, and Accounting (AAA) protocol that is commonly used today with Cisco ACS for controlling access to switch/router command-line interfaces.

Here is a great article with an overview of each:
http://www.networkworld.com/article/2838882/radius-versus-tacacs.html

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jskfanAuthor Commented:
Thank you Matt
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