--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-22T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 5498703728 dns-udp-queries-received-ipv6: 1410829376 dns-tcp-queries-received-ipv4: 332173425 dns-tcp-queries-received-ipv6: 53430034 dns-udp-responses-sent-ipv4: 5475436420 dns-udp-responses-sent-ipv6: 1465270727 dns-tcp-responses-sent-ipv4: 302313081 dns-tcp-responses-sent-ipv6: 53368693