(NetworkMonitor3.4, Microsoft's own network packet capture analysis tool, free. It is nothing more than the same as other network analysis tools, that is, capturing packets, decoding, and trying them out. Among the package capture things under windows, it is a relatively good one. It supports both windows and command line environments. This document is collected from the software help information and official website. The use of windows is exempted. This document includes command line syntax, syntax examples, and introduction to filters. All in English, if you don't like it, don't download it.)