JEREMY CIOARA.; MICHAEL VALENTINE. <br/><br/>
CCNA VOICE 640-641 : OFFICIAL CERT GUIDE 

 - 
 -  PEARSON.  2013 
 - xxvii,498p. 
<br/><br/><label>ISBN: </label>9788131786819 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NETWORKS
<br/><br/><label>Dewey Class. No.: </label>004.6 CIO  / JER