# $systemDefensePolicyRef is an EPR to the AMT_SystemDefensePolicy object created by the 'Create a System Defense Policy' use case.
$systemDefensePolicyInstance = $systemDefensePolicyRef.Get()
$instanceID = $systemDefensePolicyInstance.GetProperty("InstanceID")
# Create a reference to the CIM_EthernetPort instance, select the wired interface. 
$ethernetPortRef = $wsmanConnectionObject.NewReference("SELECT * FROM CIM_EthernetPort WHERE DeviceID='Intel(r) AMT Ethernet Port 0'")
$networkPortDefaultSystemDefensePolicyRef = $wsmanConnectionObject.NewReference("AMT_NetworkPortDefaultSystemDefensePolicy")
$networkPortDefaultSystemDefensePolicyRef.AddSelector("Antecedent", $ethernetPortRef)
# Traverse to the AMT_NetworkPortDefaultSystemDefensePolicy instances that are connected to the CIM_EthernetPort instance.
foreach($networkPortDefaultSystemDefensePolicyItem in $networkPortDefaultSystemDefensePolicyRef.Enumerate("http://schemas.dmtf.org/wbem/wsman/1/wsman/SelectorFilter", $null))
{
	# Check if it is associated to the AMT_SystemDefensePolicy instance.
	if($networkPortDefaultSystemDefensePolicyItem.Object.GetProperty("Dependent").IsA("AMT_SystemDefensePolicy"))
	{
		# Get the AMT_SystemDefensePolicy object using its EPR.
		$systemDefensePolicyInstance = $networkPortDefaultSystemDefensePolicyItem.Object.GetProperty("Dependent").Ref.Get()
		if($systemDefensePolicyInstance.GetProperty("InstanceID") -like $instanceID)
		{
			$networkPortDefaultSystemDefensePolicyRef = $networkPortDefaultSystemDefensePolicyItem.Object.ToReference("Antecedent", "Dependent")
			$networkPortDefaultSystemDefensePolicyRef.Delete()
		}
	}
}