--- service: i.root-servers.net start-period: '2015-09-16T00:00:00Z' end-period: '2015-09-17T00:00:04Z' metric: traffic-volume dns-udp-queries-received-ipv4: 4261530699 dns-udp-queries-received-ipv6: 313078150 dns-tcp-queries-received-ipv4: 29234804 dns-tcp-queries-received-ipv6: 440468 dns-udp-responses-sent-ipv4: 5836747628 dns-udp-responses-sent-ipv6: 314361950 dns-tcp-responses-sent-ipv4: 29204162 dns-tcp-responses-sent-ipv6: 444596