"Mairs, John" <br/><br/>
VPNs / 
John Mairs 
 - New Delhi:  "Tata mcgraw hill,"  2002 
 - 596p. 
<br/><br/><label>ISBN: </label>0-07-049895-4 
<br/><br/><label>Subjects--Index Terms: </label>Networking 
<br/><br/><label>Dewey Class. No.: </label>4.6