Hooper, Howard. <br/><br/>
CCNP security VPN 642-647 official cert guide / 
Howard Hooper. 
 - Indianapolis, IN :  Cisco Press,  2012. 
 - xxxi, 725 pages :  illustrations ;  25 cm. +  1 CD-ROM (4 3/4/in.) 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9781587142567 (hardcover w/cd) 
<br/><br/><label>LCCN: </label>2011023052 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks--Security measures--Examinations--Study guides.<br/>Extranets (Computer networks)--Examinations--Study guides.<br/>Telecommunications engineers--Certification--Study guides.
<br/><br/><label>Dewey Class. No.: </label>005.8076