--- service: a.root-servers.net start-period: '2015-06-15T00:00:00Z' end-period: '2015-06-15T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3114826364 dns-udp-queries-received-ipv6: 220684688 dns-tcp-queries-received-ipv4: 16845582 dns-tcp-queries-received-ipv6: 7695676 dns-udp-responses-sent-ipv4: 3140799889 dns-udp-responses-sent-ipv6: 223284114 dns-tcp-responses-sent-ipv4: 14426449 dns-tcp-responses-sent-ipv6: 6524018