NIIT <br/><br/>
Basics of network security, firewalls and VPNS 

 - New Delhi  Prentice Hall of India  2003 
 - xi, 294p.  
<br/><br/><label>ISBN: </label>8120324102 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Firewalls -- software -- Computer security