--- service: a.root-servers.net start-period: '2015-06-09T00:00:00Z' end-period: '2015-06-09T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2991101579 dns-udp-queries-received-ipv6: 222725877 dns-tcp-queries-received-ipv4: 18995567 dns-tcp-queries-received-ipv6: 5207506 dns-udp-responses-sent-ipv4: 3028809473 dns-udp-responses-sent-ipv6: 225283323 dns-tcp-responses-sent-ipv4: 16274904 dns-tcp-responses-sent-ipv6: 3723978