basic quesetion about NAS, IOS and TACACS+. :|

[efurban]

Hi, I am new to these kinda stuff, so I am not really ashamed to ask this:

1) NAS is network access server, so is router a NAS ?
2) in order to configure a TACACS+ server, NAS has to be configured first.
so, can those commands, aaa new-model
aaa authentication login default tacacs+ local
aaa authentication ppp default tacacs+
enable password cisco
be used for the Cisco 2600 router ?
if so , how do I do this ?

Thank you.

Travis