--- version: rssac002v4 service: a.root-servers.net start-period: '2021-12-05T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 4517886494 dns-udp-queries-received-ipv6: 1073836341 dns-tcp-queries-received-ipv4: 266415102 dns-tcp-queries-received-ipv6: 68435389 dns-udp-responses-sent-ipv4: 4761135228 dns-udp-responses-sent-ipv6: 1104279499 dns-tcp-responses-sent-ipv4: 262510100 dns-tcp-responses-sent-ipv6: 68460496