Just a quick word of thanks to those who have answered the questions of the initiates on this forum. I haven't posted much, but read often and it has been helpful.
I passed the 640-816 today with a 931. I finished with about ten minutes to spare. I blew a full 15 minutes on one sim question but I just couldn't let it go (too many years as a Field Service Engineer for DEC I guess ...).
I used the Cisco Press books and Chris's Train Signal Video Boot Camp series mainly, but also have been purchasing other books for reference that helped. I have a home lab with six routers, one of which pretends to be a Frame Relay Switch, and four switches.
Next up, I have the CCNA Security CBT from Train Signal that I started on this afternoon after the test. At nearly 60 years old I can't let too much time slip by ...

Thanks again, all!
Theo