What is a method by which an IP interface can be assigned to a virtual router in a PPP over ATM environment?（）

A.DHCP assigned addresses
B.RADIUS assigned addresses
C.IP numbered with a loopback reference
D.IP unnumbered with a loopback reference

A.aaa new-model
B.aaa telnet login
C.telnet authentication login
D.authentication telnet login

A.It is used to detect loops.
B.It is an interface identifier.
C.It selects a compression algorithm.
D.It specifies the transmission media.