--- service: i.root-servers.net start-period: '2013-09-23T00:00:00Z' end-period: '2013-09-24T00:00:01Z' metric: traffic-volume dns-udp-queries-received-ipv4: 2405650877 dns-udp-queries-received-ipv6: 156293198 dns-tcp-queries-received-ipv4: 6208919 dns-tcp-queries-received-ipv6: 121075 dns-udp-responses-sent-ipv4: 2485788474 dns-udp-responses-sent-ipv6: 164968082 dns-tcp-responses-sent-ipv4: 6230220 dns-tcp-responses-sent-ipv6: 142795