How does an LDAP client locate directory servers in a Distributed Environment?

To perform an operation on a particular entry, a client must be able to find the server in which that entry resides. So, for discovering the directory server, the client looks for ldap.ora in the following file system directories in order of preference.

• The directory pointed by the LDAP_ADMIN environment variable.For checking the environment variable, use the following command, 
  

$ echo $LDAP_ADMIN

• The directory ORACLE_HOME/ldap/admin
  
• The directory pointed by the TNS_ADMIN environment variable.
  
• The directory ORACLE_HOME/network/admin