--- service: a.root-servers.net start-period: '2015-08-19T00:00:00Z' end-period: '2015-08-19T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3657309296 dns-udp-queries-received-ipv6: 196367871 dns-tcp-queries-received-ipv4: 19397673 dns-tcp-queries-received-ipv6: 8826556 dns-udp-responses-sent-ipv4: 3919875290 dns-udp-responses-sent-ipv6: 202638937 dns-tcp-responses-sent-ipv4: 16046102 dns-tcp-responses-sent-ipv6: 7183288