Which of the following is implemented through scripts or smart agents that replay the users multiple log-ins
against authentication servers to verify a user’s identity which permit access to system services?

A.
Single Sign-On

B.
Dynamic Sign-On

C.
Smart cards

D.
Kerberos

Explanation:
Single Sign-On (SSO) addresses the cumbersome situation of logging on multiple times to access different
resources. In SSO, a user provides one ID and password per work session and is automatically logged-on to all
the required applications. SSO can be implemented by using scripts that replay the users’ multiple log-ins, or by
using authentication servers to verify a user’s identity and encrypted authentication tickets to permit access to
system services.
Incorrect Answers:
B: Dynamic Sign-On is not the correct term to describe an authentication system that can be implemented
through scripts or smart agents that replay the users multiple log-ins against authentication servers to verify a
user’s identity which permit access to system services.
C: Smart cards provide static or dynamic passwords or certificates to authenticate a user. The authentication
happens every time the smart card is presented and the login. This is not what is described in the question.
D: Kerberos can be used to implement Single-Sign on. However, “single sign-on” is the term described in the
question.

Krutz, Ronald L. and Russell Dean Vines, The CISSP and CAP Prep Guide: Mastering CISSP and CAP, Wiley
Publishing, Indianapolis, 2007, p. 40