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Which of the following is the most reliable authenticat…

Which of the following is the most reliable authentication method for remote access?

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A.
Variable callback system

B.
Synchronous token

C.
Fixed callback system

D.
Combination of callback and caller ID

Explanation:
A Synchronous token generates a one-time password that is only valid for a short period of time. Once the
password is used it is no longer valid, and it expires if not entered in the acceptable time frame.
Incorrect Answers:
A: Although variable callback systems are more flexible than fixed callback systems, the system assumes the
identity of the individual unless two-factor authentication is also implemented.
C: Callback systems authenticate a person, but anyone can pretend to be that person. They are tied to a
specific place and phone number, which can be spoofed by implementing call-forwarding.
D: The caller ID and callback functionality provides greater confidence and auditability of the caller’s identity.
However, unless combined with strong authentication, any individual at the location could obtain access.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 196, 696
https://technet.microsoft.com/en-us/library/cc778189(v=ws.10).aspx


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