Barker, Keith <br/><br/>
CCNA security 640-554 official cert guide / 
Keith Barker, CCIE No. 6783, Scott Morris, CCIE No. 4713 
 - Indianapolis, IN :  Cisco Press,  2013 
 - xxxii, 647 p. :  ill. ;  24 cm. +  1 CD-ROM (4 3/4 in.) 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>9781587204463 1587204460 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks--Security measures--Examinations--Study guides<br/>Computer networks--Security measures--Problems, exercises, etc.<br/>Telecommunications engineers--Certification