Question and response
Question
dig sys.cogentco.com. NS
Answer
sys.cogentco.com. 43200 NS auth1.dns.cogentco.com.
sys.cogentco.com. 43200 NS auth2.dns.cogentco.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0