Question and response
Question
dig res.cisco.com. TXT
Answer
res.cisco.com. 60 TXT "v=spf1 mx:res.cisco.com exists:%{i}.spf.res.cisco.com -all"
Authority
res.cisco.com. 300 NS ns-1392.awsdns-46.org.
res.cisco.com. 300 NS ns-1804.awsdns-33.co.uk.
res.cisco.com. 300 NS ns-876.awsdns-45.net.
res.cisco.com. 300 NS ns-89.awsdns-11.com.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0