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Designed in the 1960s the guarantee the delivery of data between nodes

The Transmission Control Protocol / Internet Protocol (TCP/IP) is a software protocol that sits on top of the Internet Addressing protocol. It uses control flow and error recovery techniques to guarantee the delivery of transmitted data from one node to another.

TCP/IP has its own reference model

Notice it only has 4 layers

The Application Layer (4)

Host-to-Host Layer (3)

Internet Layer (2)

Network Access Layer (1)