--- service: a.root-servers.net start-period: '2015-03-28T00:00:00Z' end-period: '2015-03-28T23:59:59Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2670444096 dns-udp-queries-received-ipv6: 226875520 dns-tcp-queries-received-ipv4: 19716779 dns-tcp-queries-received-ipv6: 2016945 dns-udp-responses-sent-ipv4: 2676884182 dns-udp-responses-sent-ipv6: 226420024 dns-tcp-responses-sent-ipv4: 16292172 dns-tcp-responses-sent-ipv6: 1173755