DNS servers are arranged in a way that ’ s conceptually similar to the arrangement of domains. In particular, every domain and subdomain must have associated with it server computers that are authoritative for the domain — that is, these servers can be relied upon by the rest of the Internet to provide accurate information about the names and IP addresses of computers within the domain and to know the IP addresses of servers that are authoritative for its subdomains. For instance, the name server associated with the .edu domain must know the IP address of the name server responsible for the oberlin.edu domain, and this name server must know the IP address of the www.oberlin.edu computer. At the top of the hierarchy are the root name servers , which dole out the addresses of the TLD name servers. Because the root of the domain name hierarchy is a dot ( . ), domain Understanding
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