The DNS record that contains authoritative information about zone transfers, including the primary name server and admin email is:

The DNS record that contains authoritative information about zone transfers, including the primary name server and admin email is:

• A. SOA
• B. A
• C. NS
• D. SRV

Answer: (A)

Start of Authority records hold who controls a DNS zone and how updates are managed. It designates the primary name server (the master) for the zone and the administrator’s contact mailbox, stored in the RNAME field (the mailbox is written with a dot instead of an @). It also carries the serial number and timing parameters (refresh, retry, expiry, minimum TTL) that govern how and when zone transfers occur between the primary and secondary servers. Because zone transfers depend on this authoritative information to know when to pull updates and whom to contact, the SOA record is the one that contains the essential data about zone transfers, including the primary name server and admin email. The admin email is encoded in DNS form; for example, hostmaster@example.com would appear as hostmaster.example.com in the RNAME portion. Other DNS records serve different purposes—A maps names to IPv4 addresses, NS lists the authoritative name servers for a zone, and SRV provides service location.

Start of Authority records hold who controls a DNS zone and how updates are managed. It designates the primary name server (the master) for the zone and the administrator’s contact mailbox, stored in the RNAME field (the mailbox is written with a dot instead of an @). It also carries the serial number and timing parameters (refresh, retry, expiry, minimum TTL) that govern how and when zone transfers occur between the primary and secondary servers. Because zone transfers depend on this authoritative information to know when to pull updates and whom to contact, the SOA record is the one that contains the essential data about zone transfers, including the primary name server and admin email. The admin email is encoded in DNS form; for example, hostmaster@example.com would appear as hostmaster.example.com in the RNAME portion. Other DNS records serve different purposes—A maps names to IPv4 addresses, NS lists the authoritative name servers for a zone, and SRV provides service location.