anna.cs.tau.ac.il has no CNAME records.
Question and response
Question
dig anna.cs.tau.ac.il. NS
Answer
The response has no answer records.
Authority
cs.tau.ac.il. 10800 SOA zeus-1.cs.tau.ac.il. aco.tauex.tau.ac.il. 544143 10800 3600 5184000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0