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A Brief History of DEN
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DEN was jointly proposed by Microsoft and Cisco Systems in 1997 For its original specification, the two companies drew heavily on existing directory standards and protocols The motives behind the DEN initiative are understandable enough: Microsoft needs leverage to establish Windows as a true enterprise-class server operating system, especially to compete with UNIX For Cisco's part, it wants to fulfill the vision of Internet convergence, where all communications media travel over the Internet using Cisco hardware, of course
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DEN as a De Jure Standard
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In 1998, the first draft of the DEN specification was submitted to the Desktop Management Task Force (DMTF), an industry group formed to develop standards for management of client/server systems The specification wasn't handed over to the Internet Engineering Task Force (IETF) because the biggest part of the DEN is derived from the Common Information Model (CIM), a standard developed by the DMTF In addition, most of the entities that will reside in DEN-compliant directories will come from applications and systems, not from network devices and media One point of confusion surrounding DEN is that it will be a "superdirectory," handling all network service applications In fact, the opposite is true DEN isn't intended to replace directory products at all It's meant to foster their interoperability, thereby creating the common directory data store needed to take computing to the next level
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Not a directory at all, DEN is a specification of generalized data structures organized into a comprehensive schema (A schema is an outline that is universally applicable to a general purpose) DEN designates the object classes needed to create a truly common namespace across the entire network, from ERP to DNS, to security, QoS, and beyond A namespace is a set of names that are all unique and significant The DEN mission is to foster a rigorously defined set of unique names and data formats for all network objects hardware components, QoS policies, protocols, network media, applications, security policies, and more to be shared by all directories With a common namespace, the various types of directories will be able to interoperate Given such a broad scope, the only way to make the DEN initiative feasible is to leverage existing technology wherever possible DEN does this by incorporating three existing directory standards: CIM Most DEN objects describing hardware and software are derived from the DMTF's Common Information Model X500 Much of the DEN specification describing persons and organizations is derived from X500, the global directory standard from the International Standards Organization (ISO) LDAP DEN designates the Lightweight Directory Access Protocol (LDAP) to be the vehicle for directory intercommunication Originally developed by the University of Michigan, LDAP is now under the auspices of the IETF
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Industry Acceptance of DEN
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The DEN initiative has gathered considerable momentum, with nearly 200 major vendors now signed on DEN version 3 was issued in the summer of 1999 Although the DEN specification is approaching completion, it will always remain for vendors to make their products compliant Microsoft claims that the initial release of Windows 2000 is DEN compliant specifically, that Active Directory complies with DEN Cisco has announced a DEN-compliant product called Cisco Directory Services (CDS) In addition, a new management software product will be distributed, called Cisco Networking Services for Active Directory (CNS/AD), which combines CDS with Active Directory to manage Cisco devices CDS will integrate support for Novell's NDS in a later release Other major DEN development joint efforts are underway Novell has built DEN support into NetWare 50 NDS with three key components: DHCP, DNS, and RADIUS Netscape, Nortel/Bay Networks, Lucent, 3Com, and others are also now releasing DEN- compliant products
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The DEN Specification
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Enterprises can no longer justify trying to coordinate a dozen or so disparate directories across their internetworks Doing so is not only time consuming, but greatly increases the chance for error This isn't exactly breaking news; for some time now it's been widely accepted that having individual directory services for such things as white pages, e-mail, ERP, security, and the like is ineffective and inefficient The easiest example of how integrated directories will help is that not every device will be affected when something must be updated, such as creating a new user on the network But the benefits of a common DEN namespace go beyond mere labor saving in routine administrative tasks DEN will for the first time make it possible to apply fine-grained policies, at runtime, against complex multifactor rules drawing on information from many directories having to do with security, ERP application, white pages, and so on Clearly, there is strong motivation to improve on directory services Yet substantial time, money, and training have been invested in legacy directory systems, so completely replacing them isn't the answer And, given that the directories use various data formats and protocols, integrating and synchronizing them seems an impossible task So how can the industry deliver truly integrated directory services in time for the new class of bandwidth-intensive network applications the world is counting on
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The answer is DEN In practical terms, DEN offers the various directory services a common namespace can use, regardless of the services' respective protocols or data formats The central features of DEN's design are as follows: Least effort compliance DEN does not start from scratch, but rather leverages existing technology and know-how by building upon the best of existing directory technologies Integration of network infrastructure DEN extends existing directory technology to include network devices, protocols, and media Extensibility DEN is an abstract standard that lets individual vendors implement their particular products as they see fit, as long as upper-level compliance is maintained Although DEN has received a fair amount of publicity over the past year, many are confused about what DEN is, exactly because of what it's not DEN is not a technology, not a protocol, and not an API or a product it's not even a directory It's a specification that defines how directories should store and exchange information about networks and their users
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