Which of the following protocols uses TCP port 23 by default?
A. SSH
B. Telnet
C. FTP
D. HTTP
Answer:B
Which of the following protocols uses TCP port 23 by default?
A. SSH B. Telnet C. FTP D. HTTP
Explanation: Telnet is a protocol that provides remote access to a command-line interface. It uses TCP port 23 by default. However, Telnet is not secure and has been largely replaced by SSH.