Application layer are implemented by OCI (Oracle Call Interface) in client and OPI (Oracle Program Interface) in server side.
Presentation layer protocol is call Two-Task Common (TTC) and is responsible for character set and data type conversion between client and server.
Session layer and network layer are implemented by Net8/Net9 and SQL*Net before that. The Net8 protocol has 2 components - Net Foundation and Protocol Support. Protocol Support further breaks down into 2 layers - Routing/Naming/Auth and TNS (Transport Network Substrate).
The role of TNS is to select the Oracle Protocol Adapter which wrap around one of the support transport protocol – TCPIP, name pipes and SDP (Socket Direct Protocol) for Infiband network.
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