About the Author Denise Donohue, CCIE No. 9566, is a senior solutions architect with Chesapeake NetCraftsmen. She has worked in IT since the mid-1990s. Focusing on network design since 2004, she has consulted on a wide range of networks, private and public, of all sizes, across most industries. She is author or co-author of numerous Cisco Press networking, voice, and design books. Denise lives in Maryland with her wonderfully patient and supportive husband, Kevin, and their two much less patient dogs.   Brent Stewart, CCNP, CCDP, CCSI, MCSE, is the vice president of Managed Services at Stalwart Systems (stalwartsystems.com), an innovative IT engineering firm focused on secure IT architectures. His experience includes designing and managing a large-scale worldwide voice, video, and data network. He was a course director for Global Knowledge and participated in the development of BSCI with Cisco and has written and taught extensively on CCNA and CCNP. Brent lives in Hickory, North Carolina, with his beautiful wife, Karen, and their mischievous children Benjamin, Kaitlyn, Madelyn, and William.  
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