A system administrator is configuring UNIX accounts to authenticate against an external server.
The configuration file asks for the following information DC=ServerName and DC=COM. Which of
the following authentication services is being used?

A.
RADIUS

B.
SAML

C.
TACACS+

D.
LDAP

Explanation:
The Lightweight Directory Access Protocol 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.
An entry can look like this when represented in LDAP Data Interchange Format (LDIF) (LDAP
itself is a binary protocol):
dn: cn=John Doe,dc=example,dc=com
cn: John Doe
givenName: John
sn: Doe
telephoneNumber: +1 888 555 6789
telephoneNumber: +1 888 555 1232
mail: john@example.com
manager: cn=Barbara Doe,dc=example,dc=com
objectClass: inetOrgPerson
objectClass: organizationalPerson
objectClass: person
objectClass: top

“dn” is the distinguished name of the entry; it is neither an attribute nor a part of the entry.
“cn=John Doe” is the entry’s RDN (Relative Distinguished Name), and “dc=example,dc=com” is
the DN of the parent entry, where “dc” denotes ‘Domain Component’. The other lines show the
attributes in the entry. Attribute names are typically mnemonic strings, like “cn” for common name,
“dc” for domain component, “mail” for e-mail address, and “sn” for surname.