What is the access protection system that limits connections by calling back the number of a previously
authorized location called?

A.
Sendback systems

B.
Callback forward systems

C.
Callback systems

D.
Sendback forward systems

Explanation:
Callback is when the host system disconnects the caller and then dials the authorized telephone number of the
remote terminal in order to reestablish the connection.
Incorrect Answers:
A: A sendback system is not a valid system type with regards to CISSP.
B: A callback forward system is not a valid system type with regards to CISSP.
D: A sendback forward system is not a valid system type with regards to CISSP.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. G-3