Walter J. Goralski has more than 25 years in the data communications field, including 14 years with AT&T. He is currently a Senior Member of Technical Staff with Hill Associates, a technical trading and consulting firm in Colchester, Vermont, and an adjunct professor of computer science at Pace University Graduate School in New York. He is also the author of several books on ATM, the Internet, TCP/IP, and SONET as well as articles on data communications and other technology issues. Matthew C. Kolon has more than 14 years of experience in MIS and as a consultant in computers and data communicat...