A network administrator needs to update an A record for the company's public website. The DNS infrastructure consists of one primary server and two secondary servers that provide redundancy. To ensure the change is correctly replicated, on which server must the administrator make the modification?
On any of the secondary DNS servers.
On the primary DNS server.
On the authoritative recursive server.
On both the primary and all secondary DNS servers simultaneously.
The correct answer is the primary DNS server. In a standard DNS configuration, the primary server holds the read/write copy of the zone file where all changes, additions, and deletions are made. Secondary DNS servers maintain a read-only copy of this zone file, which they receive from the primary server through a process called a zone transfer. Therefore, any modifications must be made on the primary server to be propagated to the secondaries. The other options are incorrect because secondary servers cannot be directly modified, and recursive or caching servers are not authoritative sources for the zone data.
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