The newest version of Workstation has this feature, but ESX does not yet have it.
No there is not since the networking portion is virtualized by the vmkernel -
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your guests are attached to vSwitches which are attached to pNICs. So, if you only have 1 pNIC mapped to a vSwitch, your guest will definatly know if it goes down.
The newest version of Workstation has this feature, but ESX does not yet have it.