Identify the Wireshark filter used to view packets moving without a flag set during null scan attempts.

The filter that is used to view packets moving without a flag set during null scan attempts is tcp.flags==0x000.

In a null scan, TCP packets are sent with no flags set, meaning that the flag field is equal to zero. This type of scan is designed to probe ports without triggering any responses that typical flag settings would cause. By using tcp.flags==0x000, analysts can specifically filter and observe these packets to identify any open ports on the target system that may not respond to typical SYN scans.

In terms of context, the other filters provided focus on flags that would indicate different types of TCP communication or target specific destination ports. For instance, tcp.dstport==7 would filter for packets directed to port 7, commonly associated with the Echo protocol, while tcp.dstport==25 targets SMTP (Simple Mail Transfer Protocol). Neither of these options relates to the identification of null scans, which specifically require the analysis of the flag settings to confirm there are no flags present.