.What is a callback system?

A.
It is a remote-access system whereby the remote-access server immediately calls the user back at
a predetermined number if the dial-in connection fails.

B.
It is a remote-access system whereby the user’s application automatically redials theremoteaccess
server if the initial connection attempt fails.

C.
It is a remote-access control whereby the user initially connects to the network systems via dialup
access, only to have the initial connection terminated by the server, which then subsequently dials
the user back at a predetermined number stored in the server’s configuration database.

D.
It is a remote-access control whereby the user initially connects to the network systems via dialup
access, only to have the initial connection terminated by the server, which then subsequently allows
the user to call back at an approved number for a limited period of time.

Explanation:
A callback system is a remote-access control whereby the user initially connects to the network
systems via dial-up access, only to have the initial connection terminated by the server, which then
subsequently dials the user back at a predetermined number stored in the server’s configuration
database.