Is IAS a protocol that a RAS or VPN server can use to defer a user's access request to a central RADIUS server?

Question

Quizplus · Accepted Answer

IAS (Internet Authentication Service) is a Microsoft implementation of a RADIUS server and not a protocol. It is used for centralized authentication, authorization, and accounting for users who are connecting to a network, not for deferring access requests from a RAS (Remote Access Service) or VPN server to another RADIUS server.

Is IAS a Protocol That a RAS or VPN Server