Legacy single sign on (SSO) is:

A.
Technology to allow users to authenticate to every application by entering the same user ID and password
each time, thus having to remember only a single password.

B.
Technology to manage passwords consistently across multiple platforms, enforcing policies such as
password change intervals.

C.
A mechanism where users can authenticate themselves once, and then a central repository of their
credentials is used to launch various legacy applications.

D.
Another way of referring to SESAME and KryptoKnight, now that Kerberos is the de-facto industry standard
single sign on mechanism.

Explanation:
Legacy single sign on (SSO) is a mechanism where users can authenticate themselves once, and then a
central repository of their credentials is used to launch various legacy applications.
An SSO solution may provide a bottleneck or single point of failure. If the SSO server goes down, users are
unable to access network resources. This is why it’s a good idea to have some type of redundancy or fail-over
technology in place.
Incorrect Answers:
A: Legacy single sign on (SSO) enables users to sign on once; they do not have to sign on to every application.
B: Legacy single sign on (SSO) is not technology to manage passwords consistently across multiple platforms,
enforcing policies such as password change intervals. This can be done with password synchronization.
D: Legacy single sign on (SSO) is not another way of referring to SESAME and KryptoKnight.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 177