--- version: rssac002v3 service: a.root-servers.net start-period: '2019-06-20T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 6171131594 dns-udp-queries-received-ipv6: 1040554186 dns-tcp-queries-received-ipv4: 176910332 dns-tcp-queries-received-ipv6: 36072382 dns-udp-responses-sent-ipv4: 6035108499 dns-udp-responses-sent-ipv6: 1039578550 dns-tcp-responses-sent-ipv4: 174130376 dns-tcp-responses-sent-ipv6: 37194685