Virtual Network testing

[Stuart_Luscombe () computacenter com]

Hi,

     This may be a bit of a stupid question, but is there a piece of software
that allows you to
run a virtual network? Allowing you to add in routers, hosts, switches etc. and
then test the affect
of changes to that environment without actually have to affect the live
environment.

An example of a use for this would be if a specific router went down, who would
it affect?
Or, if a virus were to get onto the network (hopefully the AV would get it
first), how would it spread?

Any ideas??

Regards
--
Stuart



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