Two-factor authentication uses something a user has in conjunction with something a user knows.
An authentication system that uses something a user has in conjunction with something a user knows is called:
Multifactor Authentication
An authentication system that uses something a user has in conjunction with something a user knows is called:
An authentication system that uses something a user has in conjunction with something a user knows is called:
Open system authentication (default).
I think one is database server authentication, the other is operating system level authentication (could be at the network level).
Authentication
It depends. For robust and high risk system, Lightweight Directory Access Protocol (LDAP) authentication, or client-side public key infrastructure authentication.
kerberos
Authentication
Access Control Systems. Authentication. Multi-factor authentication Authorization. Firewalls and Internet Security. Intrusion prevention system. Intrusion detection system.
A DRFU card works in conjunction with the transceiver on a cell phone. It is part of the radio system called the BTS.
when two factor authentication is requured
The answer depends on the type of computer system in which you are referring and too numerous to cover here given the vague nature of your question. Operating system login? Windows, OS X, Linux, Unix? ... Local or remote? Web based login? Google: computer authentication methods