--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-23T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 5285493135 dns-udp-queries-received-ipv6: 1270496748 dns-tcp-queries-received-ipv4: 332139520 dns-tcp-queries-received-ipv6: 51664594 dns-udp-responses-sent-ipv4: 5246482593 dns-udp-responses-sent-ipv6: 1308497534 dns-tcp-responses-sent-ipv4: 303075799 dns-tcp-responses-sent-ipv6: 51597972