Forouzan, Behrouz A. <br/><br/>
Data communications and networking / 
Behrouz A. Forouzan, Sophia Chung Fegan. 
 - 4th ed. 
 - Boston :   McGraw-Hill,  2007. 
 - xxxiv, 1134 p. 
<br/><br/><label>ISBN: </label>0071254427, 0070634145 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems.<br/>Computer networks.