Question and response
Question
dig _spf.cisco.com. NS
Answer
_spf.cisco.com. 1800 NS ns3.cisco.com.
_spf.cisco.com. 1800 NS ns1.cisco.com.
_spf.cisco.com. 1800 NS ns2.cisco.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0