Does replies to existing domain name contain additional section

[Praveen Kumar Amritaluru]

Hi ,

         I am not clear regarding the additional section in the replies to
queries
sent to  nameservers.

        When will the reply from nameserver contain RRs in the additional
section.

         Is it valid to have RRs in the additional section when the hostname
queried
is found in the domain for which the nameserver is authoritative of.

        Can anyone clarify this.

        Thanks in advance for your insights.

Regards,

Praveen