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Re: Advice on CCNA certification
The INTRO and ICND books from Cisco Press are great. If you know everything from cover-to-cover you should be pretty well off.
I should inform you that compared to A+ and Network+, the CCNA is brutal. Cisco exams are far more difficult than CompTIA exams by an order of magnitude. Study like you've never studied before. Memorize even the little details in the routed and routing protocols. Know IOS and how to configure a router and switch inside-out. Know the full commands. Definitely get as much hands-on experience as possible.
I highly recommend if you intend to get the CCNA to take a course supported by the Cisco Networking Academy taught by a CCAI (Cisco Certified Academy Instructor) - definitely get your hands in a real Cisco lab. It can cost a pretty penny and is quite intensive, but it is without a doubt worth every expense.
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