Chapter11 - Chapter 11: Directory Services Directory...

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Chapter 11: Directory Services
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Directory Services A directory service is a database that contains information about all objects on the network. Directory services contain data and metadata . Metadata is information about data. For example: A user account is data. Metadata specifies what information is included in every user account object.
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Directory Services Information within directories is organized hierarchically . This means that there is a strict set of rules as to where certain data is located within the directory based on the properties of that data. Unlike relational databases such as SQL where information is read and written often, information is usually only read from a directory service, but rarely is it input. For example: User account data changes very little once it has been entered.
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Early Directory Services The first directory service was developed at PARC and was called Grapevine . X.500 was developed as a directory service standard by the ISO and CCITT. Although X.500 was developed as a comprehensive standard, as with the OSI model, it was not widely deployed on real- world LANs. X.500 formed the basis of a standard that is widely deployed known as LDAP . Some X.500 conventions are used in Active Directory and eDirectory.
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LDAP Stands for L ightweight D irectory A ccess P rotocol. LDAP is a scaled-down implementation of the X.500 standard. Active Directory and eDirectory are based on LDAP. Netscape’s Directory Server was the first wide implementation of LDAP. It was used primarily for enterprise calendaring and contact management. Netscape’s product was not used for network management. Most LDAP directories use a single master method of replication.
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Chapter11 - Chapter 11: Directory Services Directory...

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