For those of us who don't memorize Tech Net for fun, a few clicks is all it takes.
You can (and should) have more than one server listed in case a DNS server is unreachable for some reason.Select do not allow dynamic updates if your DNS is not integrated with Active Directory and you don't want to allow dynamic updates.Do not allow unsecured dynamic updates unless you really know what you are doing and have a very good reason for doing so. If your DNS server ever gets a query for which it has no record, it can forward that request on to another DNS server to see if it has the answer.Select the DNS server to manage, then click the Action menu, and select Configure a DNS Server. A forward lookup zone allows you to do the standard DNS function of taking a name and resolving it into an IP address. ) Root hints only will not create a database of name records for lookups, but rather will just have the IP addresses of other DNS servers where records can be found.A reverse lookup zone allows you to do the opposite, taking an IP address and finding its name. If you already have DNS setup on your network, you'll probably want to continue using the same configuration you already have.Although there are three choices here, only two should actually be used in production.