Configure Network Services - MCSA Windows Server 2012 R2: Installation and Configuration Study Guide - page 86

Table 2.3 explains the attributes stored in the NS record.

Table 2.3 The NS record structure

Field Meaning

Name The domain that will be serviced by this name server. In this case,

I used example.com .

AddressClass Internet (IN)

RecordType Name server (NS)

Name Server Name The FQDN of the server responsible for the domain

Any domain name in the database file that is not terminated with a period
will have the root domain appended to the end. For example, an entry that
just has the name sales will be expanded by adding the root domain to the
end, whereas the entry sales.example.com. won't be expanded.

Host Record

A host record (also called an A record for IPv4 and AAAA record for IPv6) is used to
associate statically a host's name to its IP addresses. The format is pretty simple:

host_nameoptional_TTL IN A IP_Address

Here's an example from my DNS database:

www IN A 192.168.0.204
SMTP IN A 192.168.3.144

The A or AAAA record ties a hostname (which is part of an FQDN) to a specific IP
address. This makes these records suitable for use when you have devices with statically
assigned IP addresses. In this case, you create these records manually using the DNS
snap-in. As it turns out, if you enable DDNS, your DHCP server can create these for you.
This automatic creation is what enables DDNS to work.
Notice that an optional TTL field is available for each resource record in the DNS.
This value is used to set a TTL that is different from the default TTL for the domain. For
example, if you wanted a 60-second TTL for the www A or AAAA record, it would look
like this:

www 60 IN A 192.168.0.204