(Let's take a look at this course first. This course is actually two courses. The first course introduces how to use Sniffer for network fault diagnosis, as well as some methods and ideas of network management. The second course introduces how to use it. Analysis, this is Sniffer's new course, I think it's better, and the students in the previous classes also like it very much. The first class will be taught for 3 days, and the second class will be taught for 2 days.)