In 2010 ICANN commissioned a study from DNS-OARC to examine the impact of DNSSEC deployment in the root zone , and in particular the effects on clients from the large DNS responses resulting from the use of a Deliberately Unvalidatable Root Zone (DURZ). The DNS-OARC study drew upon the results of a coordinated data collection exercise by root server operators , with each data collection window timed to coincide with a transition by one or more root servers [TXT, 28 KB] from serving an unsigned root zone to serving the DURZ






