You probably should have a router or a simulation program 300-420 prep questions (this book doesn't come with one) but if you have a lot of CLI experience you can just memorize the commands.  If you apply yourself and really study this book passing the test should be pretty easy. Mr. Browning and his colleagues never fail to impress or deliver.  This will be my third CCNA re-certification, 300-420 prep questions and his publications make it easier every time.

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