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Telnet protocol is used to establish a connection to __________

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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

I got this question in an online interview.

My question is from Telnet topic in division Application Layer of Computer Network

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Best answer
The correct option is (c) TCP port number 23

Best 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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