Mike Valentine: I’d like to thank my new friends at Skyline for making me feel welcome in the world of official Cisco training. Andy, Frank, Dave, and Toby have elevated my technical and professional expertise and given me great opportunities to learn and grow. It’s my privilege to be a Skyliner.

As always, the good people at Pearson have done their best to direct the energies of an enthusiastic pair of irreverent writers. Brett, Vanessa, Chris, and all the people in the background, thank you for your wonderful work.

Steve Kalman’s guidance has been invaluable; nothing could please me more than to have his sharp eye and careful critique on this book. Thanks, Steve.

Liana and Jaine, you bring purpose and joy to my life. Thank you for ...

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