You are having problems while retrieving results after performing port scanning during internal testing. You verify that there are no security devices between you and the target system. When both stealth and connect scanning do not work, you decide to perform a NULL scan with NMAP. The first few systems scanned shows all ports open.

Which one of the following statements is probably true?

What are twp types of ICMP code used when using the ping command?

You are scanning into the target network for the first time. You find very few conventional ports open. When you attempt to perform traditional service identification by connecting to the open ports, it yields either unreliable or no results. You are unsure of which protocols are being used. You need to discover as many different protocols as possible.

Which kind of scan would you use to achieve this? (Choose the best answer)

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 is the most probable reason?

War dialing is a very old attack and depicted in movies that were made years ago.

Why would a modem security tester consider using such an old technique?

Ann would like to perform a reliable scan against a remote target. She is not concerned about being stealth at this point.

Which of the following type of scans would be the most accurate and reliable option?

You are conducting a port scan on a subnet that has ICMP blocked. You have discovered 23 live systems and after scanning each of them you notice that they all show port 21 in closed state.

What should be the next logical step that should be performed?

Which of the following would be the best reason for sending a single SMTP message to an address that does not exist within the target company?