--- service: a.root-servers.net start-period: '2015-06-01T00:00:00Z' end-period: '2015-06-01T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2785012322 dns-udp-queries-received-ipv6: 200090740 dns-tcp-queries-received-ipv4: 17885062 dns-tcp-queries-received-ipv6: 2497562 dns-udp-responses-sent-ipv4: 2811968667 dns-udp-responses-sent-ipv6: 202584589 dns-tcp-responses-sent-ipv4: 16111845 dns-tcp-responses-sent-ipv6: 1292787