MARK A. MILLER, P.E., is President of DigiNet Corporation, a Denver-based consulting engineering firm providing services in internetwork design, strategic planning, network management, and new product development. The author of the IP Library series of books (Wiley), Mr. Miller is a frequent presenter at industry events and has taught at the ComNet, Internet Telecom Expo, Networld+Interop, Comdex, and other conferences. He holds BS and MS degrees in electrical engineering and is a registered professional engineer in four states.