Figure 1-6
This illustration depicts three Web browsers connecting to an Oracle database in three different ways. The database server shows a communication stack that includes two layers. From the top down, the stack is constructed with the following layers:

RDBMS
Oracle Net

The Oracle database server is also configured to support HTTP and IIOP.

One Web browser uses the HTTP protocol to connect to the Oracle Net layer on the database server. The second Web browser uses the IIOP protocol to connect to the Oracle Net layer on the database server. The third Web browser shows a communication stack. From the top down, the stack is constructed with the following layers:

Java Applet
JDBC Thin Driver
JavaNet

This browser uses the TCP/IP network protocol to connect to the Oracle Net layer on the database.