--- service: i.root-servers.net start-period: '2015-01-15T00:00:00Z' end-period: '2015-01-16T00:00:02Z' metric: traffic-volume dns-udp-queries-received-ipv4: 3479167802 dns-udp-queries-received-ipv6: 244466175 dns-tcp-queries-received-ipv4: 7096286 dns-tcp-queries-received-ipv6: 227932 dns-udp-responses-sent-ipv4: 3453268489 dns-udp-responses-sent-ipv6: 244387836 dns-tcp-responses-sent-ipv4: 7138157 dns-tcp-responses-sent-ipv6: 233157