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DNS servers assume one of three roles: • Primary (or master) DNS Server - maintains the SOA (Start of. Authority), and contains the master zone file containing DNS is basically the phone book of the. Internet! It stores all the IP addresses (phone numbers) and domain names (people, places, and businesses). How is DNS built and how does it work? How does a query work ? Record types. Caching and Authoritative. Delegation: domains vs zones. Domain Name System (DNS) Guide. A Comprehensive and In-depth Guide to Domain Name System experts usually refer to DNS as the Phonebook of the Internet. Domain Name System (DNS). Guidelines. A. Purpose. This guide provides direction to implement available and secure DNS servers critical to the reliability of Use this command if DNS has been disabled. IP Addressing: DNS Configuration Guide. 11. Configuring DNS. Mapping Host Names to IP Addresses“Windows 2000 DNS” in this book. DNS is a distributed database that contains mappings of DNS domain names to data. It is also a protocol for Transmission