Every domain has with its relevant Authority (governing registration body of Domain Names), certain NS set as "Authoritative". All the SOA, A, AAAA, MX, TXT domain Record parameters are saved on the authoritative NS which that domain has with its competent Authority.
It means that any request made to a host of the domain in question will be addressed to the machine that such NS, set as authoritative, indicates as the machine configured for such purpose.

Like the MX records, these are zone-wide parameters, so they do not take hosts either. In general, they look like this:

        IN  NS     ns1.domain.com.
        IN  NS     ns2.domain.com.

You should have at least two name servers defined in each zone file in order to operate correctly if there is a problem with one server. Most DNS server software considers a zone file to be invalid if there is only a single name server.

As always, include the mapping for the hosts with A or AAAA records:

        IN  NS     ns1.domain.com.
        IN  NS     ns2.domain.com.
ns1     IN  A      111.222.111.111
ns2     IN  A      123.211.111.233

There are quite a few other record types you can use, but these are probably the most common types that you will come across.

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