Understanding data communications and networks 
Shay, William A. 
 - 3rd ed. 
 -  Thomson Brooks/Cole,  2004 
 - xxv, 766 p. 
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<br/><br/><label>ISBN: </label>0-534-38317-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks.
<br/><br/><label>Dewey Class. No.: </label>004.6 Sh2u 2004