--- service: a.root-servers.net start-period: '2015-09-28T00:00:00Z' end-period: '2015-09-28T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3364004917 dns-udp-queries-received-ipv6: 300427787 dns-tcp-queries-received-ipv4: 21632749 dns-tcp-queries-received-ipv6: 10844619 dns-udp-responses-sent-ipv4: 3362952663 dns-udp-responses-sent-ipv6: 298819982 dns-tcp-responses-sent-ipv4: 18397888 dns-tcp-responses-sent-ipv6: 9174323