Held, Gilbert.  x <br/><br/>
Understanding data Communications  - 

 - 7ed. 
 - New Delhi  Darling Kindersley  2002 
 - 765p 
<br/><br/>
<br/><br/><label>ISBN: </label>9788131708729 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data Communications Computer science 
<br/><br/><label>Dewey Class. No.: </label>004.6/H474u