--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-19T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 4659309224 dns-udp-queries-received-ipv6: 1247346037 dns-tcp-queries-received-ipv4: 269245982 dns-tcp-queries-received-ipv6: 81389201 dns-udp-responses-sent-ipv4: 4807150229 dns-udp-responses-sent-ipv6: 1369576422 dns-tcp-responses-sent-ipv4: 262135764 dns-tcp-responses-sent-ipv6: 81032729