--- service: a.root-servers.net start-period: '2015-06-16T00:00:00Z' end-period: '2015-06-16T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3189889638 dns-udp-queries-received-ipv6: 225101948 dns-tcp-queries-received-ipv4: 17021114 dns-tcp-queries-received-ipv6: 7159590 dns-udp-responses-sent-ipv4: 3216511163 dns-udp-responses-sent-ipv6: 227836300 dns-tcp-responses-sent-ipv4: 14490238 dns-tcp-responses-sent-ipv6: 5974217