DOMAIN
A domain is a set of network resources (applications, printers, and so forth) for a group of users. The user needs only to log in to the domain to gain access to the resources, which
may be located on a number of different servers in the network. The ‘domain’ is simply
your computer address not to confuse with an URL. A domain address might look
something like 211.170.469.
DNS( Domain Name System)
The Domain Naming System (DNS) is a service that resolves host names to IP addresses. These can be names of computers within an internal network or names of computers on the Internet. Clients send name resolution requests to a DNS server, and the DNS server responds with the IP address. The client computer then uses the returned IP address as the destination IP address for data traffic.
DNS is essential on a Microsoft domain. Active Directory requires DNS to locate servers running specific services, such as domain controllers.
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