--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-31T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 4954406351 dns-udp-queries-received-ipv6: 1207070719 dns-tcp-queries-received-ipv4: 312387045 dns-tcp-queries-received-ipv6: 75010541 dns-udp-responses-sent-ipv4: 4954933397 dns-udp-responses-sent-ipv6: 1241525570 dns-tcp-responses-sent-ipv4: 286178440 dns-tcp-responses-sent-ipv6: 74925525