redirect.cisco.com has no CNAME records.
Question and response
Question
dig redirect.cisco.com. NS
Answer
The response has no answer records.
Authority
cisco.com. 1722 SOA ns1.cisco.com. postmaster.cisco.com. 1182002 7200 1800 864000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0