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Each line is a text description that defines a single resource record (RR).The description consists of several fields separated by white space (spaces or tabs) as follows: The name field may be left blank.The DNS System powers the Internet as we know it today and is responsible for converting domain names into IP addresses and for placing them on the correct hosting server.But the DNS system would have been just a theoretical concept, if TTL was not presented.The TTL value can be set from one to several hours, if you are not planning any changes to your domain's DNS records in the meantime.If you need to make such changes, you will have to decrease the TTL value entry to several minutes to avoid any outdated data on your website.

Net:: DNS:: Header objects represent the header section of a DNS packet.

NSD, Power DNS) are using the zone files only as a starting point to compile them into database format, see also Microsoft DNS with Active Directory-database integration.

A zone file is a sequence of entries for resource records.

TTL is an acronym for Time To Live and refers to the capability of the DNS servers to cache DNS records.

It represents the amount of time that a DNS record for a certain host remains in the cache memory of a DNS server after the latter has located the host's matching IP address.

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