--- service: d.root-servers.net start-period: '2016-02-21T00:00:00Z' end-period: '2016-02-21T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3968824699 dns-udp-queries-received-ipv6: 423183534 dns-tcp-queries-received-ipv4: 21123199 dns-tcp-queries-received-ipv6: 958615 dns-udp-responses-sent-ipv4: 3952395043 dns-udp-responses-sent-ipv6: 422901443 dns-tcp-responses-sent-ipv4: 21100771 dns-tcp-responses-sent-ipv6: 958548