30.7. Creating a New Slave Zone
A slave or secondary zone is one for which your DNS server gets the list of records from a master server for the zone. Generally, slave servers are used to reduce the load on the primary server or act as a backup in case it goes down. For important zones (such as a company's Internet domain), you should always have at least one slave server so that your website is still accessible and email can still be delivered even if the primary goes down.
The secondary DNS server for a domain should not usually be located on the same network as the master, so that the failure of that network cannot take them both down. Many ISPs and hosting companies will host secondary zones for their customer's domains for free, on their ...
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