--- version: rssac002v3 service: a.root-servers.net start-period: '2021-04-01T00:00:00Z' metric: traffic-volume dns-udp-queries-received-ipv4: 5686475547 dns-udp-queries-received-ipv6: 1273708245 dns-tcp-queries-received-ipv4: 321745576 dns-tcp-queries-received-ipv6: 125871615 dns-udp-responses-sent-ipv4: 5634644649 dns-udp-responses-sent-ipv6: 1297395434 dns-tcp-responses-sent-ipv4: 301784748 dns-tcp-responses-sent-ipv6: 126152169