<P> The function of a root name server may also be implemented locally, or on a provider network . Such servers are synchronized with the official root zone file as published by ICANN, and do not constitute an alternate root . </P> <P> As the root name servers are an important part of the Internet, they have come under attack several times, although none of the attacks have ever been serious enough to severely affect the performance of the Internet . </P> <P> The DNS Root Server System Advisory Committee is an ICANN committee . However, the root zone is controlled by the United States Department of Commerce who must approve all changes to the root zone file requested by ICANN . ICANN's bylaws assign authority over the operation of the root name servers of the Domain Name System to the DNS Root Server System Advisory Committee . </P> <P> The root zone file is a small (about 2 MB) data set whose publication is the primary purpose of root name servers . </P>

Which organisation supervises the dns root server system