Red Hat DIRECTORY SERVER 7.1 - ADMINISTRATOR Administrator's Manual page 627

multi-master replication An advanced replication scenario in which two servers each hold a copy
of the same read-write replica. Each server maintains a changelog for the replica. Modifications
made on one server are automatically replicated to the other server. In case of conflict, a time stamp
is used to determine which server holds the most recent version.
multiplexor The server containing the database link that communicates with the remote server.
n + 1 directory problem The problem of managing multiple instances of the same information in
different directories, resulting in increased hardware and personnel costs.
name collisions Multiple entries with the same distinguished name.
nested role Allows the creation of roles that contain other roles.
network management application Network Management Station component that graphically
displays information about SNMP managed devices (which device is up or down, which and how
many error messages were received, etc.).
network management station See NMS.
NIS Network Information Service. A system of programs and data files that Unix machines use to
collect, collate, and share specific information about machines, users, filesystems, and network
parameters throughout a network of computers.
NMS Also Network Management Station. Powerful workstation with one or more network
management applications installed.
ns-slapd Red Hat's LDAP Directory Server daemon or service that is responsible for all actions of
the Directory Server. See also slapd.
object class Defines an entry type in the directory by defining which attributes are contained in
the entry.
object identifier Also OID. A string, usually of decimal numbers, that uniquely identifies a
schema element, such as an object class or an attribute, in an object-oriented system. Object
identifiers are assigned by ANSI, IETF or similar organizations.
OID See object identifier.
operational attribute Contains information used internally by the directory to keep track of
modifications and subtree properties. Operational attributes are not returned in response to a
search unless explicitly requested.
Glossary 627