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Exam 312-50v13 Topic 1 Question 1042 Discussion
Actual exam question for ECCouncil's 312-50v13 exam
Question #: 1042
Topic #: 1
Question #: 1042
Topic #: 1
What is the proper response for a NULL scan if the port is closed?
Suggested Answer: C Vote an answer
A NULL scan is a TCP port scanning technique in which the attacker sends a TCP packet with no flags set.
This technique is commonly used during the network reconnaissance and port-scanning phase to identify open and closed ports while attempting to evade some security controls and logging mechanisms.
According to TCP/IP behavior defined in RFC 793 and discussed in CEH network scanning concepts, when a NULL packet is sent to a closed port, the target system should respond with a TCP RST (Reset) packet. The RST packet indicates that no service is listening on that port and that the connection attempt should be terminated immediately.
When the port is open, most UNIX/Linux systems generally do not respond to a NULL scan packet.
Therefore, scanners such as Nmap interpret no response as either an open or filtered port and RST as a closed port.
Option A (No response) is associated with an open port in a typical NULL scan, not a closed one. Options B, D, E, and F are incorrect because FIN, SYN, ACK, and PSH are not the expected responses from a closed port during a NULL scan.
This technique is commonly used during the network reconnaissance and port-scanning phase to identify open and closed ports while attempting to evade some security controls and logging mechanisms.
According to TCP/IP behavior defined in RFC 793 and discussed in CEH network scanning concepts, when a NULL packet is sent to a closed port, the target system should respond with a TCP RST (Reset) packet. The RST packet indicates that no service is listening on that port and that the connection attempt should be terminated immediately.
When the port is open, most UNIX/Linux systems generally do not respond to a NULL scan packet.
Therefore, scanners such as Nmap interpret no response as either an open or filtered port and RST as a closed port.
Option A (No response) is associated with an open port in a typical NULL scan, not a closed one. Options B, D, E, and F are incorrect because FIN, SYN, ACK, and PSH are not the expected responses from a closed port during a NULL scan.
by Verne at Sep 04, 2026, 03:31 AM
Here are all the actual test exam dumps for IT exams. Most people prepare for the actual exams with our test dumps to pass their exams. So it's critical to choose and actual test pdf to succeed.
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