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Technically, DEN is an open specification that defines an object-oriented information model for network entities It defines these entities as classes, which together form the data model for all possible network information (in theory, at least) Not limited to network infrastructure devices and software, these classes include the breadth of client/ server systems and applications Additional classes profile users and policies to control the use of network resources Each DEN class describes a set of objects that share the same attributes, operations, methods, relationships, and semantics A DEN object is a network element that exists within a class, with a well-defined boundary: an identity that encapsulates state and behavior In other words, DEN is a very detailed specification that describes anything a human or machine using a network is likely to need to know Each such element description is a class DEN class descriptions are as neutral as possible in order to maximize the scope of its usage For example, the DEN class for network security protocols must be usable just as easily by a Kerberos product as by a CHAP product Therefore, security protocols are contained within DEN's Security Service class, a subclass of the AAA class (If you're new to networking lingo, AAA stands for Authentication, Authorization, and Accounting a loosely defined standard for managing network security) The AAA class is, in turn, a subclass of the Network Service class, and so forth on up the line, as depicted in Figure 2-1
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Figure 2-1: DEN is an object-oriented data model of network entities called classes and objects Thus, the AAA class is a container of various service classes, including the Security Service class In the parlance of data models, a container is a class whose instances are collections of other objects, and not an object that itself represents something concrete The important focus in Figure 2-1 is the DEN terminology A class is a prototype of a unique data structure designed to serve as a template for a particular
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entity The data structure arranges the class's attributes (also called variables) in a record that best represents the relationships of the attributes A class inherits some of its properties from a parent class higher up the food chain, and classes below it derive some of their properties from the higher class thus the terms superclass and subclass (Veterans of object-oriented programming will recognize here that DEN uses a single-inheritance model) An object is a unique instance of a class's data structure in other words, a unique list of attributes The idea is for a unique property to be stored in only one place When a DEN-compliant directory passes a message, the receiving directory knows where to find specific objects and how to map them into its particular data structure format NoteIn multiple inheritance, a class inherits properties from more than one parent for example, a Layer2Protocol DEN object inheriting from both the NetworkProtocol and Service objects DEN specifies single inheritance for simplicity Directories are, in essence, "name-search engines," and by using single inheritance, any name can be resolved by simply accessing the first property signature match encountered In a multiple inheritance scheme, several matches might be found pointing to different parents, requiring a choice
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DEN Takes an Open Approach to Networked Directories
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It's best to think of the DEN specification as a taxonomy of network objects to which directory services map their particular data In other words, DEN attempts to classify network objects systematically, in a way that makes the most sense to all the directories that support it DEN does this by detailing implementation-neutral schema for describing objects As mentioned, DEN only provides the organization and the higher-level objects It's up to the vendor to fill in the blanks to make its product interoperable using DEN
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Directory services are physically distributed but logically centralized In other words, directories sit on machines in various areas of the network topology, but the directories contain a common set of information The network thus gains the intelligence on where resources are located, how they can be used, and who may use them If directory services were held in a physically centralized store, they would be harder to find and slower to use, and would generate unacceptable levels of network overhead traffic Further distinguishing them from other types of data stores, directories work best with data that changes infrequently For example, network management systems using the SNMP protocol like to take updates every five minutes or so, on such metrics as "packets per second" and the like By contrast, directories work best with data elements that are updated every day or so An example of this would be Cisco's CDS taking in new QoS policies from a network manager on a weekly basis Even a hierarchical directory is relatively flat and, therefore, no substitute for a database Directories don't have relational data structures, don't support transaction semantics or stored procedures, can't do two-phased commits, don't support a sophisticated query language such as SQL, and don't have integral reporting capability Without the room to store large objects such as BLOBs (binary large objects), directories aren't a good substitute even for a robust file system Last, directories lack the support for connectionless transport that DNS has, and are not seen as a potential replacement for DNS the world's largest distributed database
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What DEN does do is define a base schema of classes for the types of things that appear in network directories This alone is evidence that, while not itself a technology, DEN is nonetheless an undertaking of great scope Not only must it provide a taxonomic structure that captures all data stored in the various directories security data for RADIUS, domain-to-IP address mappings for DNS, and so on but DEN must do so in a way that accommodates the subtle differences in each vendor's implementation of services in its own products In other words, DEN must provide a directory namespace sufficiently broad and accurate to handle the stable of network directory services as they now exist
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