I noticed Udemy offers some Wireshark courses. Definitely want to look into those. Many many years ago I was trained to configure Cisco routers for all the bank branches at a bank I worked for. I was sent to Cisco configuration school. However I remember very little about it. Cisco engineers came in at the beginning to help us get started. I remember they had a network protocol analyzer, that I’m guessing were probably proprietary. I would look at this strange network gibberish on the screen that the engineer understood. Since then I’ve always wanted to know more about networking. This was the late 1990s. According to Wikipedia Wireshark’s Initial release was 1998. Wireshark’s about page says…Wireshark is the world’s foremost and widely-used network protocol analyzer.
Side note: I also installed Suse Linux that I bought at CompUSA (now defunct) and ran software called MRTG (Multi Router Traffic Grapher. I would have never have remembered that name if it wasn’t for a log-file I kept) that would show network traffic in these very nice graphs in almost realtime. I probably have some examples somewhere. These graphs that I could pull up for any branch were very cool looking for the late 1990.