Zone files contain information about a namespace and are stored in the named working directory, /var/named/, by default. perform tasks or apply special settings to the zone. Resource records define the parameters of the zone and assign identities to individual hosts. Directives are optional, but resource records are required to provide name service to a zone.
All directives and resource records should go on their own individual lines.
Comments can be placed after semicolon characters (;) in zone files.
Directives begin with the dollar sign character ($) followed by the name of the directive. They usually appear at the top of the zone file.
The following are commonly used directives:
$INCLUDE — Configures named to contains the following line:
Any names used in resource records that do not end in a trailing period (.) will have example.com appended to them.
$TTL — Sets the default Time to Live (TTL) value for the zone. This is the length of time, in seconds, a zone resource record is proliferate resource record changes. an FQDN.
Next, two nameservers are listed as authoritative for Section 13 to 13 an FQDN. It looks very similar to a standard zone file, except that PTR resource records are used to link the IP addresses to a fully qualified domain name.
A PTR record looks similar to this:
The <last-IP-digit> is the last number in an IP address,.