--- service: a.root-servers.net start-period: '2015-06-07T00:00:00Z' end-period: '2015-06-07T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2473221537 dns-udp-queries-received-ipv6: 192547713 dns-tcp-queries-received-ipv4: 16107363 dns-tcp-queries-received-ipv6: 4546614 dns-udp-responses-sent-ipv4: 2506997338 dns-udp-responses-sent-ipv6: 194636129 dns-tcp-responses-sent-ipv4: 13876793 dns-tcp-responses-sent-ipv6: 3226586