data which an application wants to send and passed onto the transport layer
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Hop to hop delivery is between two nodes connected to the same network by a link and is done by data link layer while application to application (process to process) delivery is done in the transport layer by making sure that the whole message arrives intact and in order, by realising the relationship between the packets in that layer.
TELNET operates at Application Layer in TCP/IP Model. It's an Application to establish a connection to TCP Port Number 23, where a Telnet server application (telnetd) is listening.
That would be layer 7 - the application layer.
Application Layer