At the top of the DNS server hierarchy are the ____ servers that publish a directory of the next level of DNS servers.

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The root name servers are the top-tier DNS servers that maintain the directory of all top-level domain (TLD) nameservers. They publish a directory of the next level of DNS servers. Local caching servers store recently accessed DNS information. Authoritative servers contain the actual DNS records for a particular domain. Namespace refers to the overall system in which domain names are organized and managed.

At the Top of the DNS Server Hierarchy Are the ____