Transmission Control Protocol/Internet Protocol (TCP/IP) governs the way data travel from one device to another as a suite of protocols.
IP is a network layer protocol and provides datagram routing services. IP’s main task is to support internetwork addressing and packet routing. It is a connectionless protocol that envelops data passed to it from the transport layer. It works with other protocols to transmit the data to the destination computer and then reassemble the data back into a form that the application layer can understand and process.
The text explains IP as:
"The data, IP, and network relationship can be compared to the relationship between a letter and the postal system:
- Data = Letter
- IP = Addressed envelope
- Network = Postal system
The message is the letter, which is enveloped and addressed by IP, and the network and its services enable the message to be sent from its origin to its desti-nation, like the postal system."
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