--- service: a.root-servers.net start-period: '2015-05-09T00:00:00Z' end-period: '2015-05-09T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2401765869 dns-udp-queries-received-ipv6: 198026138 dns-tcp-queries-received-ipv4: 21309848 dns-tcp-queries-received-ipv6: 1916742 dns-udp-responses-sent-ipv4: 2349228251 dns-udp-responses-sent-ipv6: 202865793 dns-tcp-responses-sent-ipv4: 17244353 dns-tcp-responses-sent-ipv6: 931368