Vacca, John R. <br/><br/>
Firewalls :  jumpstart for network and systems administrators / 
John R. Vacca, Scott Ellis 
 - Amsterdam :  Elsevier/Digital Press,  2005 
 - xxx, 418 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>11555582974 9781555582975 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Firewalls (Computer security)