DNS request timed out. timeout was 2 seconds

Hi

Why it is saying DNS request timed out was 2 seconds and showing the IPs under non-authoritative answers?

This is member DC windows 2008 R2. Primary DNS is set as 127.0.0.1 and secondary DNS is set to 192.168.10.6 which is main DC.

C:\Users\admin>nslookup filter-servers.mailguard.com.au
Server:  localhost
Address:  127.0.0.1

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
Non-authoritative answer:
Name:    filter-servers.mailguard.com.au
Addresses:50.23.252.165