Discussion
Which protocol enables the establishment of a connection to a remote system in such a way that the local terminal appears to be a terminal at the remote system?
Answer: C
The protocol is TELNET.
TELNET (teletype network) is a client-server protocol that lets a user log in to a remote computer over a network, so that the local terminal behaves as if it were a terminal attached directly to the remote system. It traditionally uses TCP port 23 and sends data unencrypted, which is why SSH has largely replaced it.
SMTP transfers e-mail between servers, FTP transfers files between computers, and DNS translates domain names into IP addresses. None of them provides an interactive remote terminal session.
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