Iolair,
Yes, CCNA has gotten that much harder, Cisco dropped a lot of CCNP stuff down into the CCNA when they took the Novell, ISDN and Token Ring stuff out.
As far as the sims, we have discussed copy run start etc. here many times, I ALWAYS run copy run start AND I always exit the router. At a Cisco convention several years ago I talked with one of the guys that did the CCNA exam questions, I asked him about copy run start and exiting out and he said he could not disclose anything but that we should treat the sim as we would a real router. He then asked me if I would run copy run start and if I would leave a router logged in .........
Others here have said that you don't have to - all I can say is it sure will not hurt you if you put in extra commands
As far as working with routers and switches - make sure you are practicing on YOUR OWN CISCO LAB WHERE YOU CAN BREAK THINGS, working on a production network can help, but you know that things don't happen often, if things are running right, and you sure can't run all the debug commands etc that you would want to!!!
The Cisco CCNA is a lot about troubleshooting, the best way to learn this is to have 3 routers and 2 switches and configure them again and again and break them - look at the output of all the different commands covered by CCNA - do it again and again and again .........
As far as your questions - you are right - all the answers can be right - what Cisco wants is the "rightest" answer
And on a couple tests my feeling was that the right answer I took was only because the other 4 answers were NOT right - Cisco loves to play games and make you think and show you can rationalize things and work under the stress of time.
If you have not done it - get the latest book from Sybex, CCNA Study Guide by Todd Lammel and read it from end to end and
DO ALL THE LABS and EXAMPLES in the book - do them again and again looking at the output......
And don't be down, the test has changed a lot in 4 years, working in the field does not ALWAYS get you all the hands on experience they expect from a CCNA now - get a lab or at the very least an emulator!!!!
Good luck!!
E.A. Broda
CCNA, CCDA, CCAI, Network +