Holden, Greg <br/><br/>
Guide to firewalls and network security :  with intrusion detection and VPNs / 
Greg Holden 
 - Boston :  Course Technology,  2004 
 - 433 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0619130393 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Firewalls (Computer security)<br/>Firewalls (Computer security)--Problems, exercises, etc.<br/>Computer networks--Security measures<br/>Extranets (Computer networks)