Hello,
The problem I had with 290 was the different types of groups involving inter-domain activities. The exam book on 290 did not go much into inter-domain relationships, and I suffered a bit on the exam, but still passed it on my first run too.
I also found it very handy to install a sample set of servers, and have them work with each other. Next time around, I will make 2 domains, and have them interact and see how things fare.
Good Job on your success!
Christian
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