RADIUS
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you need to buy it.
you can't. W.G.A. [ Windows Genuine advantage ] is a Windows download
Network Level Authentication is used to authenticate Clients and servers to the network in Windows XP. It is also used to establish a remote desktop connection.
Domain controller
Domain controller
This update helps windows verify it's validation key. It will detect and request any unauthoriced or pirated Windows copy to authenticate.
The domain controller is used to authenticate the user and the operation master role is PDC emulator.It uses kerberos protocol to authenticate
the user can authenticate in the AD . in the user properties tab you can define the dial up connection properties, vpn server is alredy there in the AD network so both can be authenticated.
windows
The Action Center
windows re (recovery environment)
Windows Recovery Environment