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The Domain Name System (DNS) is a service designed to resolve Internet Protocol (IP) addresses to host names.
Any computer providing domain name services is a DNS name server. No matter where in the DNS namespace the server resides, it’s still a DNS name server.
Resource Record (RR) is a DNS entry that specifies the availability of specific DNS services.For Example, an MX record specifies the IP address of a mail server, and Host (A) records specify the IP addresses of workstations on the network.
A set of Active Directory domains that share a common namespace and are connected by a transitive two-way trust. Resources can be shared between the domains in an Active Directory.
A client can make three types of queries to a DNS server: recursive, inverse, and iterative.
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