--- service: a.root-servers.net start-period: '2015-07-12T00:00:00Z' end-period: '2015-07-12T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 4118763992 dns-udp-queries-received-ipv6: 252109897 dns-tcp-queries-received-ipv4: 17238445 dns-tcp-queries-received-ipv6: 10397765 dns-udp-responses-sent-ipv4: 4142516325 dns-udp-responses-sent-ipv6: 254019707 dns-tcp-responses-sent-ipv4: 14640099 dns-tcp-responses-sent-ipv6: 9055031