TELNET control information [closed]

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As said in RFC 854:

A TELNET connection is a Transmission Control Protocol (TCP)
connection used to transmit data with interspersed TELNET control
information.

So, what's the TELNET control information? Can you get an example?

Answer 1

Control information is sent using sequences beginning with the IAC code. See the section titled TELNET COMMAND STRUCTURE in the RFC.

Answer 2

Telnet control information varies form setting the terminal type, to allowing read-ahead. Including setting window size and turning on/off of echo.