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Kyle Cassidy is a network engineer at the University of Pennsylvania's prestigious Annenberg School for Communication. He has been writing about technology since 1986; The Concise Guide to Enterprise Internetworking and Security is his fifth book. Kyle lives in Philadelphia with his wife, Linda Harris; their cat, Thunderbelly; their VAX 4000/300, Saturn; and a spiffy 1927 Victrola that possesses neither name nor IP address (although the cat does not exactly have an IP address, he does have a domain name). Kyle has been an MCSE since 1998, but he's still an okay guy.