--- service: a.root-servers.net start-period: '2015-02-28T00:00:00Z' end-period: '2015-02-28T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2487627528 dns-udp-queries-received-ipv6: 208296747 dns-tcp-queries-received-ipv4: 14410746 dns-tcp-queries-received-ipv6: 2117555 dns-udp-responses-sent-ipv4: 2473549760 dns-udp-responses-sent-ipv6: 207688194 dns-tcp-responses-sent-ipv4: 12299834 dns-tcp-responses-sent-ipv6: 1185924