DNS roles - Red Hat Enterprise Linux Tutorial

- [Narrator] In DNS, there are several roles for hosts which interact with it. These include, primary DNS server, secondary DNS server, caching-only DNS server, forwarding DNS server and lastly DNS client. We'll quickly go over them now. A primary DNS server or master server has control over its domains and/or subdomains. Each domain has to have a primary DNS server. It may also have other types of servers as well which we'll talk about in a moment. On the primary DNS server is a collection of zone files. A zone file describes the domains and/or subdomains that the primary DNS server manages. Changes to the zone files will only be done on the primary DNS server. A secondary DNS server or slave server also have authority over its domains and holds copies of the zone files. These are copied over from the primary DNS server. Any changes to the zone files are done on the primary DNS server and the changes propagate automatically. A third type of DNS server is caching-only server. A…