This is my second opportunity to write for Cisco Press, so I would like to thank Brett Bartow for once again providing me with this enviable opportunity.

To Maurilio and Leah, who reviewed this publication, I would like to say thanks for the time and experience you have put into this. You have shaped my work, and I really value your contributions.

I’d like to thank my current manager, Dave Mack. I am very lucky to have you as a manager, Dave. You really helped me this year, for which I am extremely grateful. I would also like to thank my previous manager, Nick Cooke. Nick, thanks for having faith and supporting my career. You still have some credits to use up, so just call when you want to cash them in, just not so early next time, ...

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