--- service: a.root-servers.net start-period: '2015-04-01T00:00:00Z' end-period: '2015-04-01T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3156683569 dns-udp-queries-received-ipv6: 240226568 dns-tcp-queries-received-ipv4: 20861491 dns-tcp-queries-received-ipv6: 2267624 dns-udp-responses-sent-ipv4: 3139664924 dns-udp-responses-sent-ipv6: 239633124 dns-tcp-responses-sent-ipv4: 17267457 dns-tcp-responses-sent-ipv6: 1190339