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#### 3.2.1 GIOP

GIOP is the transport layer of the CORBA specifications. GIOP is a generic protocol. This personality implements GIOP versions from 1.0 to 1.2 along with the CDR representation scheme to map data types between the neutral core layer and CDR streams. It also provides the following dedicated instances:

- IIOP supports synchronous request semantics over TCP/IP,
- IIOP/SSIOP supports synchronous request semantics using SSL sockets,
- MIOP instantiation of GIOP enables group communication over IP multicast,
- DIOP relies on UDP/IP communications to transmit one-way requests only.