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Question :-

An attacker is attempting to telnet into a corporation's system in the DMZ. The attacker doesn't want to get caught and is spoofing his IP address. After numerous tries he remains unsuccessful in connecting to the system. The attacker rechecks that the target system is actually listening on Port 23 and he verifies it with both nmap and hping2. He is still unable to connect to the target system. What could be the reason?
The firewall is blocking port 23 to that system
He needs to use an automated tool to telnet in
He cannot spoof his IP and successfully use TCP
He is attacking an operating system that does not reply to telnet even when open

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