def network_client(self):
        self.log('Getting network client')
        if not self._network_client:
            self._network_client = NetworkManagementClient(
                self.azure_credentials,
                self.subscription_id,
                base_url=self._cloud_environment.endpoints.resource_manager,
                api_version='2017-06-01'
            )
            self._register('Microsoft.Network')
        return self._network_client