1. What is a directory ?
Directory is a specialized database that store small piece of information. Directory tend to be write once and read many times.
2. Use of directories
* Look up email address and contact information
* Manage and synchronize User aythenticaton
* Store and search arbitrary data.
3. LDAP
LDAP means light weight directory access protocol. First implimentation used ladp as gateway protocol. In 1995 stand alone ldap daemon for servers are introduced.
4. LDAP models
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There are 4 LDAP models
* Information model
It defines how individual entries in directory are structured.
* Naming model
In this entries are defined in hierarchical tree
* Functional Model
What operation can be performed on the directory.
* Security model
It defines how directory information is protected from the unauthorized access.
5. INFORMATION MODEL
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* The fundamental unit of data storage in directory is called an entry.
* Entry may represent an object and describe the selected characteristics or attribute of an object.
* attribute have different type indicating what sort of information is stored in attribute.
* Each attribute in an entry has an value assosciated with it.
* Unique distinguished name that identifies the indvidual entry in the directory tree.
