--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-09T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 5134897347 dns-udp-queries-received-ipv6: 1201129831 dns-tcp-queries-received-ipv4: 275324121 dns-tcp-queries-received-ipv6: 56064232 dns-udp-responses-sent-ipv4: 5395343551 dns-udp-responses-sent-ipv6: 1254179266 dns-tcp-responses-sent-ipv4: 272139198 dns-tcp-responses-sent-ipv6: 55981565