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Which of these scans can be used to find out information about the firewall on a network?
Inverse TCP Flag Scanning
LIST Scan
XMAS Scan
ACK Flag Probe Scan
TCP Connect Scan
UDP Scan
The ACK scanning method is used to determine whether the host is protected by some kind of filtering system. In ACK scanning method, the attacker sends an ACK probe packet with a random sequence number where no response means that the port is filtered (a stateful inspection firewall is present in this case); if an RST response comes back, this means the port is closed. (https://www.hackingloops.com/ack-flag-scanning-attack/)
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