4.2. Domain Name System

Domain Name System (DNS) servers are primarily used to provide name resolution of hostnames. Every host that has an IP address can also have a hostname. Instead of remembering the IP address, we remember the name, and then DNS resolves the name to an IP address.

Within a Windows network using Active Directory Domain Services, DNS is also used to find specific servers through the use of SRV records. For example, a service may need to find a global catalog server or a PDC emulator. SRV records are used to find servers with these capabilities, and more.

When learning DNS (and preparing for the 70-646 exam), it's important to have a solid understanding of DNS zone types, zone files, and zone records. This chapter will cover ...

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