--- service: a.root-servers.net start-period: '2013-12-15T00:00:00Z' end-period: '2013-12-15T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 1246863097 dns-udp-queries-received-ipv6: 61550487 dns-tcp-queries-received-ipv4: 6107522 dns-tcp-queries-received-ipv6: 1164123 dns-udp-responses-sent-ipv4: 1246247858 dns-udp-responses-sent-ipv6: 61561242 dns-tcp-responses-sent-ipv4: 6476562 dns-tcp-responses-sent-ipv6: 121