I studied for 3 days after work and completed it. I feel that the summary is well done. And personally, when I tried to study on my own by reading network books, it was really hard. It was too abstract and it was difficult to understand, even though it was IT technology, but it felt like philosophy. I learned it comfortably through online lectures. One thing that was disappointing was that it would have been good if there had been time to practice Wireshark, but that was a bit disappointing. First of all, since the concept was to memorize the lecture, I was the only one who was disappointed. It was a satisfactory lecture, and I am looking forward to the advanced course.