INTRODUCTION
OVERVIEW OF THE INTERNET
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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telnet
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ftp
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ssh
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http
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Detailed explanation-1: -It means that the standard port assigned to telnet is 23. It is the default port. If you install a telnet server with a default configuration it will listen to port 23. Accordingly if you use a telnet client without specifying a port, it will try to connect to the port 23 of the destination.
Detailed explanation-2: -It is configured to provide TELNET remote access (without a password) that pops a shell as root. If an attacker can connect to port 23 on the device, he can completely compromise it.
Detailed explanation-3: -TELNET is commonly used by terminal emulation programs that allow you to log into a remote host. However, TELNET can also be used for terminal-to-terminal communication and interprocess communication. TELNET is also used by other protocols (for example, FTP) for establishing a protocol control channel.