FREE CCNA Network Simulations - Dr Jalal Raissi

I found the network simulations developed by Dr. Jalal Raissi of DeVry University, Georgia to be very useful - especially as he uses Cisco Packet Tracer which is the simulator used in my college course.  I assume you can get it from Cisco and in any case the text of Dr Raissi's simulations are also available so you can read them if you can't replicate them. His website is
www.itucator.com/ttt/PTSimlets.htm

There are seven simulations and they are definitely the kind of things you are likely to get in the exam i.e.

CCNA 640-802 Basic Security Simlet
CCNA 640-802 EIGRP Simlet
CCNA 640-802 Extended ACL Simlet
CCNA 640-802 NAT Smlet
CCNA 640-802 RIPv2 Simlet
CCNA 640-802 Topology Simlet
CCNA 640-802 VTP Simlet

The introduction says five network simulations not seven. This may be out of date but I found I could not open one or two of them.  However the text of all seven is available at another website "CCNA Exam Questions Explained" run by Testinside.
http://testinside.blogspot.ie/