Transport protocols assist communication between application programs. They are used to pass messages from one port to another. The message is passed through a connection, or connection-less method of communication. TCP(Transfer Control Protocol) is an example of the connection method of communication. TCP establishes a link between the IP addresses of the sourced and the destination ports. These ports are bound via this link till the connection is terminated or broken. A simple example is that of a telephone conversation - a connection is established, the conversation takes place, and then, the connection is terminated. TCP implements the connection as a stream of bytes from the source to the destination.
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