Packet Tracer

Packet Tracer Version 6.2 Student Download 

http://www.networxsecurity.org/fileadmin/user_upload/exe/CiscoPacketTracer6.2forWindowsStudentVersion.exe

How to install Cisco Packet Tracer on Mac Os X - YouTube - https://www.youtube.com/watch?v=15JHd_lc_TY