. RADIUS : service installed on a seperate server or on the DC , it provides more security for users authentication. it is the one responsible for validating the user name and password of any user from the DC. to protect it from hacking ,for example
: It is refered also as " IAS " Internt Authentication Service, you can install that service as follows
Control panel > Add/Remove Programs\Add/Remove windows component\Networking service\Details\Internet Authentication Service
. And Sure you must read more about that service
Good Luck
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