Thomas, Tom <br/><br/>
Network security first-step / 
Tom Thomas 
 - Indianapolis, IN :  Cisco Press,  2004 
 - xxi, 456 p. :  ill. ;  23 cm. 
<br/><br/> Includes glossary and index 
<br/><br/><label>ISBN: </label>1587200996 9781587200991 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks--Security measures