--- service: i.root-servers.net start-period: '2013-09-04T00:00:00Z' end-period: '2013-09-05T00:00:03Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2332718015 dns-udp-queries-received-ipv6: 149674166 dns-tcp-queries-received-ipv4: 5238144 dns-tcp-queries-received-ipv6: 173152 dns-udp-responses-sent-ipv4: 2289014607 dns-udp-responses-sent-ipv6: 149509555 dns-tcp-responses-sent-ipv4: 5206897 dns-tcp-responses-sent-ipv6: 174301