Which Wireshark filter detects a SYN-FIN flood DoS attack?

The correct answer, which detects a SYN-FIN flood DoS attack, is associated with the filter that specifies the TCP flags indicative of both SYN and FIN being set at the same time. This is unusual behavior for TCP connections because a SYN flag is typically used to initiate a connection, while a FIN flag signals the termination of a connection.

A SYN-FIN flood attack leverages the abnormality of having both flags set in a packet to exploit TCP handshakes, leading to potential connection issues for legitimate users. The filter that shows both SYN (0x002) and FIN (0x001) set is represented as tcp.flags==0x003. When applied, this filter effectively captures packets that possess both flag states, indicating the presence of a SYN-FIN flood attack and allowing for identification of disruptive behaviors on a network.

Utilizing this specific filter helps network administrators monitor and respond to such unauthorized activities, as normal TCP connections should not exhibit this dual flag setting. Thus, the option that indicates both flags set to 1 is crucial in identifying SYN-FIN flood attacks in network traffic analysis.