Data communications and networs. 
By Achyut S Godbole. 
 - 1st. 
 - New Delhi.:  Tata mcgraw hill.,  2009. 
 - xi, 503 p.:  ill.;  22 cm. 
<br/><br/><label>ISBN: </label>978-0-07-047297-6 0-07-047297-1 
<br/><br/><label>Subjects--Index Terms: </label>Computer science. Data communications and networks. 
<br/><br/><label>Dewey Class. No.: </label>004.6