Question and response
Question
dig mktdns.com. NS
Answer
mktdns.com. 3600 NS ns2.mktdns.com.
mktdns.com. 3600 NS ns1.marketo.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0