Should we have NS records ?

[Tal Dayan]

Hello,

Our DNS server is backed up by 4 remote secondary servers that are
registered with the
root servers for our domain, while our own server is not registered. This
configuration seems to work just fine.

Do we need to have NS records for the 4 secondary servers ? Do we need to
have NS record
for our name server (which is not registered) ?

Currently we have only an NS record for our own server (which is not
registered) and none for the secondary servers.

Thanks,

Tal