What does an attacker use to determine which network ports are listening on a potential target device?
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A. B. C. D.B.
The correct answer to the question is B. port scanning.
Port scanning is a technique used by attackers to discover which network ports are open and actively listening on a potential target device. Network ports are communication endpoints that allow network protocols to send and receive data between devices.
An attacker can use port scanning to identify which services or applications are running on a target device, as each application or service typically uses a specific network port to communicate. Once an attacker has identified which ports are open, they can use this information to attempt to exploit vulnerabilities in the services or applications running on the device.
Port scanning can be done using a variety of tools and techniques, such as:
TCP Connect Scanning: This technique involves attempting to establish a full TCP connection with the target device on each port to determine if it is open.
SYN Scanning: This technique involves sending a SYN packet to the target device on each port and analyzing the response to determine if the port is open.
UDP Scanning: This technique involves sending a UDP packet to the target device on each port and analyzing the response to determine if the port is open.
Idle Scanning: This technique involves using a zombie host to send packets to the target device and analyzing the response to determine if the port is open.
It is important for network administrators to be aware of the various port scanning techniques and implement security measures to protect their network devices from such attacks. This can include implementing firewall rules, using intrusion detection and prevention systems, and disabling unnecessary services and applications on network devices.