Telnet protocol is used to establish a connection to __________

A. Tcp port number 21
B. Tcp port number 22

C. Tcp port number 23

D. Tcp port number 25

Explanation: TCP port 21 is used for FTP, TCP port 22 is used for SSH and TCP port 25 is used for SMTP. Telnet provides access to a command line interface on a remote computer using the TCP port number 23.

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