--- service: a.root-servers.net start-period: '2015-05-28T00:00:00Z' end-period: '2015-05-28T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2816248103 dns-udp-queries-received-ipv6: 188332231 dns-tcp-queries-received-ipv4: 19379460 dns-tcp-queries-received-ipv6: 2403825 dns-udp-responses-sent-ipv4: 2844339103 dns-udp-responses-sent-ipv6: 190567642 dns-tcp-responses-sent-ipv4: 17563806 dns-tcp-responses-sent-ipv6: 1161963