You can delete a network interface as long as it's not attached to a virtual machine. If it is attached to a virtual machine, you must first place the virtual machine in the stopped (deallocated) state, then detach the network interface from the virtual machine, before you can delete the network interface. To detach a network interface from a virtual machine, complete the steps in the Detach a network interface from a virtual machine section of the Add or remove network interfaces article. Deleting a virtual machine detaches all network interfaces attached to it, but does not delete the network interfaces.
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