--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-26T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 4647053985 dns-udp-queries-received-ipv6: 1045432387 dns-tcp-queries-received-ipv4: 309403354 dns-tcp-queries-received-ipv6: 46311094 dns-udp-responses-sent-ipv4: 4636213503 dns-udp-responses-sent-ipv6: 1074250205 dns-tcp-responses-sent-ipv4: 284611618 dns-tcp-responses-sent-ipv6: 46299074