Is there a way to test for network connectivity (and a way to simulate it)

Is there a way to test for network connectivity, which API to look into? Also, is there a way to test that code in the simulator, that is, to turn off the network in the simulator.
Thanks

A peek in the docs would help- there is a TON of information there.
You might also try the Reachability sample app for ideas:
http://developer.apple.com/iphone/library/samplecode/Reachability/index.html

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