ignoring incorrect nameservers in authority section

[pyh at mail.nsbeta.info]

Sunil Shetye writes: 

> 
> Case 2: Lame Server Reply 
> 
> ===================================================================
> $ dig +norecurse @a.iana-servers.net. example.org.
> ;; flags: qr ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0 
> 
> ;; QUESTION SECTION:
> ;example.org.		IN  A 
> 
> ;; ANSWER SECTION:
> example.org.	    172800  IN	A   192.0.32.10 
> 
> ;; AUTHORITY SECTION:
> example.org.	    172800  IN	NS  ns1.example.org.
> example.org.	    172800  IN	NS  ns2.example.org.
> =================================================================== 
> 
> This is a lame server reply. bind ignores this reply. bind will give a
> server fail reply to the client. 
> 
 

Would you please tell me why this is a lame server reply? why bind will 
give a server fail reply to the client? Thanks again a lot. 

Regards.