Aspiring ethical hacker here, how much of networks should I know?

I know that I should not only know about networks but also programming, Linux, Windows to get a solid base before studying how hacking works. I am watching the same videos that people watch to pass the Cisco certification and using flashcards. Should I prepare like I were going to pass Ciscos test? Or just get to know about networks superficially with a handful of videos or a short guide? Any recommendations? Also, I plan just to become a bounty hunter of vulnerabilities, and just do it as a hobby.

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from hacking: security in practice https://ift.tt/bondz75