Which of the following protocols uses port 23, by default?
A.
FTP
B.
FTPS
C.
HTTPS
D.
TELNET
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Telnet port 23?
Typically, this protocol is used to establish a connection to Transmission Control Protocol (TCP) port number 23, where a Telnet server application (telnetd) is listening. Telnet, however, predates TCP/IP and was originally run over Network Control Program (NCP) protocols.
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