This figure shows the Oracle Internet Directory/Oracle9i Technology Stack. The top of the stack is labeled LDAP clients (using C, Java, or PL/SQL). Below it is the next stack, labeled Public Network Infrastructure (intelligent switches). It is followed by LDAP Server (Oracle directory server and Oracle directory replication server). The next layer is Private Network Infrastructure (redundant NICs, etc.). The lowest layer is LDAP Data Storage (Oracle9i database and Oracle Net listener)