Robert The Cisco Academy program does a very good job of preparing instructors (and students) for CCNA. I had 15 years in data comm and networking before going for CCAI/CCNA, and had to study quite a bit to get the Cisco view of the world. Of course IOS commands are key (and becoming more important with sims) but many of the questions require students to compare/contrast multiple technologies or concepts. If nothing else, look for a local Cisco academy program (at a junior college probably) and sign up for a class. Once signed up, you have access to *ALL* of the material (all four semesters). The books are excellent references, but the "e-sims" are limited. Invest in either routers or a full RouterSim. If you plan to teach, you'll need a stack of routers anyway (bill them to your company). Build and troubleshoot the "Semester 2 lab" (five routers, plus hubs and switches), and you'll be ready to go. Good Luck. I took the CCNA after teaching 3 semesters (out of 4) plus studied the rest, and got 975 (out of 1000) on the CCNA exam. Good Luck, Don
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