Gilbert Held is an internationally recognized author and lecturer who specializes in the application of computer and communications technology. The author of over 40 books covering personal computers, data communications, and business trade topics, he is the only person to twice win the competitive Karp Interface Award. A winner, as well, of the American Publishers Institute and numerous other industry awards, Mr. Held was selected by Federal Computer Week as one of the top 100 persons in government, industry, and academia who has made a difference in the acquisition and use of computer systems. Among his other books are Voice Over Data Networks; Cisco Security Architecture; Cisco Router Performance Field Guide; and Voice/Data Internetworking, all from McGraw-Hill.