Introduction
Welcome to CCNA! Recently Cisco Press came to me and told me, albeit very quietly, that there was going to be some changes made to the CCNA certification exam, and asked whether I would be interested in updating my CCNA Portable Command Guide for release around the time of the announcement of the new exam. I was already working on the various command guides for the new CCNP certification exams, but I felt that a revision wouldn't take a lot of time, as hopefully there would still be a lot of concepts that hadn't changed.
I have long been a fan of what I call the "Engineering Journal"—a small notebook that can be carried around and that contains little nuggets of information—commands that you forget, the IP addressing scheme of ...
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