While adding a new A record to the BIND zone file for the internal finance.example.com DNS zone, you notice the file begins with the directive
$ORIGIN finance.example.com.
Any record name that does not end with a dot will have that origin automatically appended. The application team has asked you to enter the server name as a fully qualified domain name (FQDN) that is absolute so the origin will not be appended again. Which record name meets this requirement?
In a DNS zone file, a name that ends with a trailing dot is treated as an absolute (fully qualified) domain name. The dot represents the root of the DNS hierarchy, so BIND will not append the current $ORIGIN. "app05.finance.example.com." therefore resolves exactly as written. If the dot were omitted, BIND would treat the name as relative and append finance.example.com again, producing an invalid duplicate. The shorter labels lack the parent domain and are not fully qualified.
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What is a Fully Qualified Domain Name (FQDN)?
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