At which layers of the OSI model are the primary functions of the TCP/IP and IPX/SPX protocols performed?

The TCP/IP, and IPX/SPX protocols function at the Network and Transport Layers of the OSI model. For this reason, they are often referred to as 'Network' and 'Transport' protocols. The IP and IPX protocols function at the lower Network Layer by routing and relaying between workstations.

TCP and SPX function primarily at the next higher Transport Layer to provide for the reliability of the communication link. More.

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