--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-08T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 5052324704 dns-udp-queries-received-ipv6: 1183187536 dns-tcp-queries-received-ipv4: 273740785 dns-tcp-queries-received-ipv6: 54643228 dns-udp-responses-sent-ipv4: 5297218585 dns-udp-responses-sent-ipv6: 1226018626 dns-tcp-responses-sent-ipv4: 270741376 dns-tcp-responses-sent-ipv6: 54607327