thanks CiscoGuy33,
ISDN and STP are maybe the only two areas where I feel a bit underprepared. I've had a lot of hands-on practice in the lab, so I feel I'll do well with setting up OSPF, swith and router configurations and the other things you mentioned.
I've taken CCNA 1 through 4, and am now using Testking's materials to get some question practice for the exam. I've taken Microsoft's 70-270 (and passed), Testking definetly helped there. Testking materials have quite a bit of wrong answers to their questions, but I like to think they come pretty close to what I should see on the exam (also, it makes me feel good about myself being able to say to myself "hey, that answer's definetly wrong".)
Am I going in the right direction studying from Testking's materials?