--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-07T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 5164873978 dns-udp-queries-received-ipv6: 1251565907 dns-tcp-queries-received-ipv4: 274489046 dns-tcp-queries-received-ipv6: 55310662 dns-udp-responses-sent-ipv4: 5370363958 dns-udp-responses-sent-ipv6: 1289246617 dns-tcp-responses-sent-ipv4: 271364321 dns-tcp-responses-sent-ipv6: 55286377