Figure 5-5. Layers Used in an Initial Connection.

this illustration depicts the various layers of stack communication used in an initial connection. On the client side, from the top down, the stack includes the following layers:

• Client Application (uses OCI)

• Presentation - TTC

• Oracle Net Foundation Layer

• Oracle Protocol Support

• Net work Protocol (TCP/IP, TCP/IP with SSL, SDP, and Named Pipes)

On the server side, from the top down, the stack includes the following layers:

• Listener and RDBMS

• Oracle Net Foundation Layer

• Oracle Protocol Support

• Network Protocol (TCP/IP, TCP/IP with SSL, SDP, and Named Pipes)