I checked the Cisco site that the latest CCNA 200-120,100-101 ICND1 exam and 200-101 ICND2 exam are available for candidates,The old version 640-802,640-822,640-816 will expired after September 30,2013.but I want to know if I need to take CCNA exam now,which one should I choose?The old one or the new one?Thanks.