network admin you have to know how to hack, to prevent it, right
Technically, no. All you need to know is how to setup the network and make it effective for users to use it. Ideally, the answer would be yes but there are many who think that learning to hack means you will hack. They often forget the importance of ethics, something you show well. Personally, if you were my student, I'd be giving you more activities to do or hiring you as an assistant.