    # File lib/fog/terremark/vcloud.rb, line 68
            def default_network_id
              if default_vdc_id
                @default_network_id ||= begin
                  networks = get_vdc(default_vdc_id).body['AvailableNetworks']
                  if networks.length == 1
                    networks.first['href'].split('/').last.to_i
                  else
                    nil
                  end
                end
              else
                nil
              end
            end