312-38 Exam Dumps : Certified Network Defender (CND)

 A TCP null scan attempt is a technique used in network scanning where the TCP packet sent has no flags set. This type of scan can sometimes penetrate through routers and firewalls that filter incoming packets based on certain flags because the absence of flags can prevent the packet from being filtered out. The TCP null scan is particularly useful for identifying open ports on a target system. If a port is open, the target system will not respond to the null scan, but if the port is closed, the system will send a TCP RST packet in response. This scanning method is not supported by Windows because Windows systems typically respond with a RST packet regardless of whether the port is open or closed, making it ineffective for distinguishing between the two states on those systems.

References: The TCP null scan’s ability to bypass certain types of filters and its behavior in response to open and closed ports are documented in various network security resources, including the Nmap documentation and other network security analysis articles12. These sources confirm the effectiveness of TCP null scans in penetrating through filters set up by routers and firewalls and their unsupported status on Windows systems.

The IP address range from 0.0.0.0 to 127.255.255.255 falls under Class A. In the Class A type of network, the first octet (the first 8 bits of the IP address) is used for the network part, and the remaining 24 bits are used for host addresses. The default subnet mask for Class A is 255.0.0.0, which aligns with the given network’s default subnet mask. Class A networks are designed to support a very large number of hosts. The first bit of a Class A address is always set to 0, which means the first octet can range from 1 to 127, thus including the given IP address range.

References: This explanation is based on standard networking principles regarding IP address classes as outlined in resources like the Meridian Outpost article on IPv4 address classes1, and is consistent with the objectives and documents of the EC-Council’s Certified Network Defender (CND) program.

 The attack described in the question is a Social Engineering Attack. This type of attack involves manipulating or deceiving people into divulging confidential information such as bank account details, credit card numbers, and other sensitive data. Social engineering attacks exploit human psychology rather than technical hacking techniques to gain access to systems, networks, or physical locations, or for financial gain. Attackers may use various tactics such as phishing, pretexting, baiting, or tailgating to trick individuals into providing the information they seek1.

References:

• Understanding and Preventing Social Engineering Attacks - EC-Council1.
• Certified Network Defender (CND) Course Outline - EC-Council2.
• Certified Network Defender - EC-Council3.