--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-28T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 5138354211 dns-udp-queries-received-ipv6: 1206445956 dns-tcp-queries-received-ipv4: 310365115 dns-tcp-queries-received-ipv6: 50772087 dns-udp-responses-sent-ipv4: 5135528398 dns-udp-responses-sent-ipv6: 1259997845 dns-tcp-responses-sent-ipv4: 284297462 dns-tcp-responses-sent-ipv6: 50682842