1. I don't think it's necessary to go into detail about base conversion. --> It's necessary to understand the concept of subnet mask!!! 2. I think the data transmission method (supplement) can be deleted. There are a lot of unnecessary words. (This is going to be difficult. It's going to be hard to understand... etc.) 3. I took the course to learn the knowledge to apply vehicle internet. I was very satisfied because I was able to learn much more knowledge than I needed. However, I deducted one star because the Inflearn platform does not allow review. Other platforms allow you to review the courses you have taken for life, or at least for a year.