What is true regarding TCP port 23?

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Son Pham Hong · Accepted Answer

Port 23 is the well known port for the telnet service which is a plain text protocol that should no longer be used.

Son Pham Hong · Answer

Port 23 is the well known port for the SSH service which provides secure logins.

Son Pham Hong · Answer

Port 23 is the well known port for the rlogin service which is SSL secured by default.

Son Pham Hong · Answer

Port 23 is the well known port for the system login services which are encrypted when the user runs the starttls command in his login shell.

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