Cioara, Jeremy <br/><br/>
CCNA voice 640-461 :  Official cert guide / 
Jeremy Cioara; Michael Valentine. 
 - Indianapolis, Ind. :  Cisco,  2013. 
 - xxvii, 498 p. :  ill.;  24 sm. 
<br/><br/><label>ISBN: </label>978-1-58720-417-3 1-58720-417-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computing equipment