I just completed my Wireshark class with Larry Young as the instructor. Let me tell you that before taking this class I was overwhelmed, and did not understand anything about protocol analyzing. I can confidently say now that I am competent, and I fully understand the fundamentals in troubleshooting a network with Wireshark. This is all thanks to this excellent instructor. Larry explained even the most boring and difficult concepts using real-world scenarios that brought the much-needed insight to fully grasp them. Throughout the class, we used the material provided but he also complimented it with some of his own aid materials. This was a very pleasant experience and that is exactly why I felt the urge to leave an online review for others to see. Go learn Wireshark and if Garry is available that's your guy!