Burns, David...[et al.].  <br/><br/>
Offical cert guide:  CCNP security IPS 642-627 / 

 - New Delhi,  Pearson Education,  c2012. 
 - xxxiv, 630p. ;  ill. ;  24 cm.  
<br/><br/><label>Dewey Class. No.: </label>005.8076