--- service: i.root-servers.net start-period: '2013-09-07T00:00:00Z' end-period: '2013-09-08T00:00:02Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2082946021 dns-udp-queries-received-ipv6: 139653960 dns-tcp-queries-received-ipv4: 4525718 dns-tcp-queries-received-ipv6: 264188 dns-udp-responses-sent-ipv4: 2028841522 dns-udp-responses-sent-ipv6: 139673467 dns-tcp-responses-sent-ipv4: 4485794 dns-tcp-responses-sent-ipv6: 272726