pmdf01a.rit.edu has no CNAME records.
Question and response
Question
dig pmdf01a.rit.edu. NS
Answer
The response has no answer records.
Authority
rit.edu. 2059 SOA ns1a.rit.edu. root.rit.edu. 140083911 3600 600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0