--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-18T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 4742298332 dns-udp-queries-received-ipv6: 1263496773 dns-tcp-queries-received-ipv4: 275195368 dns-tcp-queries-received-ipv6: 78239176 dns-udp-responses-sent-ipv4: 4886173083 dns-udp-responses-sent-ipv6: 1384433592 dns-tcp-responses-sent-ipv4: 266926344 dns-tcp-responses-sent-ipv6: 78049968