March 2003
Intermediate to advanced
308 pages
9h 36m
English
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LDAP Models
LDAP models represent the services provided by a server, as seen by a client. They are abstract models that describe the various facets of an LDAP directory. RFC 2251 divides an LDAP directory into two components: the protocol model and the data model. However, in Understanding and Deploying LDAP Directory Services, by Timothy A. Howes, Mark C. Smith, and Gordon S. Good (MacMillan), four models are defined:
- Information model
The information model provides the structures and data types necessary for building an LDAP directory tree. An entry is the basic unit in an LDAP directory. You can visualize an entry as either an interior or exterior node in the Directory Information Tree (DIT). An entry contains information about an instance of one or more
objectClasses. TheseobjectClasses have certain required or optional attributes. Attribute types have defined encoding and matching rules that govern such things as the type of data the attribute can hold and how to compare this data during a search. This information model will be covered extensively in the next chapter when we examine LDAP schema.- Naming model
The naming model defines how entries and data in the DIT are uniquely referenced. Each entry has an attribute that is unique among all siblings of a single parent. This unique attribute is called the relative distinguished name (RDN). You can uniquely identify any entry within a directory by following the RDNs of all the entries in the path from the desired node to the ...
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