Frequently asked questions in Juniper certs:
What are the certification paths? (http://www.certforumz.com/index.php/topic,174.0.html)
Free Books for Juniper cert preparation (http://www.certforumz.com/index.php/topic,173.0.html)
Network Simulator for Juniper Junos preparation (http://www.certforumz.com/index.php/topic,131.0.html)
Free study material for certification prep
Juniper Questions
Juniper JNCIA labs
Which network simulator for Juniper Junos JNCIA/JNCIS preparation?