Which one of the following authentication mechanisms creates a problem for mobile users?

A.
Mechanisms based on IP addresses

B.
Mechanism with reusable passwords

C.
One-time password mechanism.

D.
Challenge response mechanism.

Explanation:
Mobile users can receive different IP address as they connect to different internet access points. This causes
authentication problems. The mobile IP technology addresses this problem. It allows a user to move from one
network to another and still use the same IP address.
Incorrect Answers:
B: Reusable passwords present no problem for mobile users.
C: One-time passwords work fine for mobile users.
D: Challenge response authentication gives mobile users no specific problems.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 238