--- service: a.root-servers.net start-period: '2015-04-15T00:00:00Z' end-period: '2015-04-15T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3278207984 dns-udp-queries-received-ipv6: 244760975 dns-tcp-queries-received-ipv4: 24936581 dns-tcp-queries-received-ipv6: 2680852 dns-udp-responses-sent-ipv4: 3259647678 dns-udp-responses-sent-ipv6: 243925332 dns-tcp-responses-sent-ipv4: 19875347 dns-tcp-responses-sent-ipv6: 1677061