Hi there, I have a question, please. I'm new to linux and I'm learning with unix academy training DVDs. The training comes bundled with many Linux distros, and I initially installed and been using Ubuntu for my lessons (it was a random choice). I do have IT experience, but not with Linux (databases, app servers, win admin). I know that Red Hat is most widely used, when it comes to large scale enterprise installations.
Now I'm stuck in a confusion: is CentOS really the same as Red Hat, and could it be used for training for Red Hat? Are these two absolutely identical?