Network simulator

Hi to u all
I am looking for a network simulator that enables me to test my network topology, routers , switches, and anything related to networking .
it must work on windows and 4free.
thanks in advance
ferasshAsked:
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chicagoanCommented:
many of the cisco testprep books and CBT coursed have a router simulator, you could try to pick one us second-hand

Boson NetSim incorporates switches too, but again not free though they do have some free labs

http://www.semsim.com/ is shareware

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micke70Commented:
You could give NS a try, but it might be to much work the get to run on Win.
http://www.isi.edu/nsnam/ns/
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