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Start of Authority(SOA) records store the information related to DNS servers like the administrator of the DNS zone, the version of the files, the number of seconds a secondary name server should wait before retrying a failed zone transfer, and the maximum number of seconds that a secondary name server can use the data before it expires.
DNS zone transfers are carried out to duplicate DNS data in multiple DNS servers. During a zone transfer, DNS records will be transferred from a primary server to a secondary server, and the SOA record will be the first one to be sent. This record will be used by the secondary server to determine whether the version is up-to-date. Also, an SOA record is necessary to stick to the IETF standards.