This book is dedicated to my wife and true love, Carlene. Besides being my unconditional supporter, she is also my co-author on two wonderful long-term projects: our daughters Carolina and Cecília. I wholeheartedly dedicate this writing to both of them, too.
I also dedicate this publication to my parents, Honorio and Cleia, who have taught me that one can only learn by being fearless and humble.
Finally, this book is dedicated to every person who is (or once was) a CCNA candidate. Your passion, commitment, and integrity are the strong threads that wove our connected world together.