Tonight I read about DLSW until I scared the crap out of myself.
Then I reviewed OSPF, which I thought I knew like the back of my hand, and discovered some surprises there too (mostly stuff I forgot because we never use).
What I'm learning from the practice tests is that they're often highly esoteric and contrived. It's not just "design, configure, and document such-and-such a network." I'm sure I could do that, I do that forty hours a week as it is. Instead it's "configure this network so that, let's see, on Tuesdays user Frank can log in to this part of it, but that access is only good for ten minutes, and oh by the way don't let traffic flow like it would optimally, instead force it to do this kind of strange thing, and if there are any PC's on VLAN 10, don't let them reach NetBIOS servers on VLAN 20. Unless of course it's this particular NetBIOS name, then it's okay." And on and on. Basically the contrivances are to force the test taker to use, at some point, every Byzantine little feature Cisco ever designed into their equipment.
That makes it more a test of memorization. And I don't do so good on those, as my grades from long ago in Classical Civ and Developmental Psych demonstrated.
I need to find a way to get my right brain more involved with the learning process here.