Which of the following uses port 23 by default?

A.
TELNET

B.
IMAP

C.
FTP

D.
SNMP

Explanation:

Telnetis a network protocol used on the Internet or local area networks to provide a bidirectional
interactive text-oriented communication facility using a virtual terminal connection. User data is
interspersed in-band with Telnet control information in an 8-bit byte oriented data connection over
the Transmission Control Protocol (TCP).