--- service: a.root-servers.net start-period: '2015-01-01T00:00:00Z' end-period: '2015-01-01T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2655141541 dns-udp-queries-received-ipv6: 202603175 dns-tcp-queries-received-ipv4: 34854323 dns-tcp-queries-received-ipv6: 2699530 dns-udp-responses-sent-ipv4: 2654318082 dns-udp-responses-sent-ipv6: 202555422 dns-tcp-responses-sent-ipv4: 33546741 dns-tcp-responses-sent-ipv6: 1588152