How different is networking on the simulator vs. on an actual iOS device? That 
is, at what level does the simulator connect to the host Mac? I imagine it's 
one of
        (a) The system calls — socket(), connect(), write(), etc. — are 
forwarded to the Mac system calls
        (b) The simulator has its own implementation of networking and talks 
directly to the host network interface

I ask because I'm wondering how necessary it is to run network-related tests on 
iOS hardware as opposed to the simulator. Obviously the former is better, but 
it's harder to set up and requires access to a lot more devices, so our QE team 
ends up doing mostly the latter.

—Jens
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