--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-27T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 5014913247 dns-udp-queries-received-ipv6: 1130787310 dns-tcp-queries-received-ipv4: 317890645 dns-tcp-queries-received-ipv6: 50905197 dns-udp-responses-sent-ipv4: 4997974556 dns-udp-responses-sent-ipv6: 1172489215 dns-tcp-responses-sent-ipv4: 290104375 dns-tcp-responses-sent-ipv6: 50836307