modules in authorize{} and authenticate{} sections

[bastardinho69]

Hi, guys,

I have successfully set up FreeRADIUS server to use Active Directory to 
authenticate LAN users.
My authorize{} and authenticate{} section configuration in radiusd.conf 
file looks like this:

authorize {
       preprocess
       eap
       mschap
   }
authenticate {
       Auth-Type MS-CHAP {
       mschap
       }
   eap
   }

As u see, in both sections there is modules eap and mschap mentioned. 
Can anybody tell me why it is so? Or where to look for the answer? I 
have been checking the logs from running radius in debug mode but i 
cannot find the definite answer, for example, in conversation between 
radius server and supplicant, mschap in authorize section always returns 
noop, so my question is- why it is needed there if it always returns noop?

Thank you.
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