Vacca, John R. <br/><br/>
Firewalls :  jumpstart for network and systems administrators / 
John R. Vacca, Scott R. Ellis. 
 - 1st  ed. 
 - London :  Digital Press,  2005. 
 - xxx, 416  p. 
<br/><br/><label>ISBN: </label>8131203409 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Firewalls (computer security)