Empson, Scott <br/><br/>
CCNA portable command guide / 
Scott Empson 
 - 2nd ed. 
 - Indianapolis, IN  :  Cisco Press ,  c2008 
 - 356 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>1587201933 9781587201936 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks--Examinations--Study guides<br/>Internetworking (Telecommunication)--Examinations--Study guides<br/>Electronic data processing personnel--Certification