Which of the following protocols is MOST likely to be leveraged by users who need additional
information about another user?

A.
LDAP

B.
RADIUS

C.
Kerberos

D.
TACACS+

Explanation:
A ‘directory’ contains information about users.
The Lightweight Directory Access Protocol (LDAP) is a directory service protocol that runs on a
layer above the TCP/IP stack. It provides a mechanism used to connect to, search, and modify
Internet directories.
The Lightweight Directory Access Protocol (LDAP) is an open, vendor-neutral, industry standard
application protocol for accessing and maintaining distributed directory information services over
an Internet Protocol (IP) network. Directory services play an important role in developing intranet
and Internet applications by allowing the sharing of information about users, systems, networks,
services, and applications throughout the network. As examples, directory services may provide
any organized set of records, often with a hierarchical structure, such as a corporate email
directory. Similarly, a telephone directory is a list of subscribers with an address and a phone
number.