--- service: a.root-servers.net start-period: '2015-09-11T00:00:00Z' end-period: '2015-09-11T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 4834700024 dns-udp-queries-received-ipv6: 287281611 dns-tcp-queries-received-ipv4: 20857655 dns-tcp-queries-received-ipv6: 10410259 dns-udp-responses-sent-ipv4: 4862676529 dns-udp-responses-sent-ipv6: 290186580 dns-tcp-responses-sent-ipv4: 17937694 dns-tcp-responses-sent-ipv6: 8623493