Curious to learn more hands-on tools and possible conduct lab like scenarios.
CEH is highly build Agnostic, you use a build that you can most easily manage and manipulate.
More broadly, you will need to know the eccentricities of most builds to be able to understand the behaviors of your test system and test environment.
To that end, nothing will prepare you more than completing http://www.linuxfromscratch.org/. At the end of that process you can make informed decisions about what build is most efficient for you, as well as know how to handle the environments you will be testing.
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