--- service: i.root-servers.net start-period: '2013-09-17T00:00:00Z' end-period: '2013-09-18T00:00:01Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2262196864 dns-udp-queries-received-ipv6: 160038277 dns-tcp-queries-received-ipv4: 5180237 dns-tcp-queries-received-ipv6: 116360 dns-udp-responses-sent-ipv4: 2283289907 dns-udp-responses-sent-ipv6: 167372417 dns-tcp-responses-sent-ipv4: 5218084 dns-tcp-responses-sent-ipv6: 146127