What functionality hangs up on a remote caller and looks at a table of predefined valid phone numbers?
A.
Caller ID
B.
RAS
C.
Callback
D.
NOS
Explanation:
C: The goal of a callback system is to provide another layer of authentication. For an attacker to compromise this setup successfully and obtain unauthorized
access, she would need to be at the preconfigured phone number or reconfigure the telephone companys equipment to forward the call to her.