Forouzan, Behrouz A. Data communications and networking / Behrouz A. Forouzan with Sophia Chung Fegan. - 4th ed. - Boston : McGraw-Hill, 2006. - xxxiv, 1134 p. ill. ; Includes index. ISBN: 0071254420 Subjects--Topical Terms: Data transmission systems.Computer networks. Dewey Class. No.: 004.6