Struggling with DirectAccess subject in 70-741

Hi Everyone,
I am preparing for the exam 70-741 and I am struggling with the subject DirectAccess... it loos like it is an endless subject, also many examples speaking about certificates and PKI and this subject is supposed to be explained under the exam 70-742!
any help with an easy to grasp study guide?
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I've found some videos on youtube that was helpful in setting up the lab and I am going to mention them here for reference in case someone needs them in the future.