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For the exam, you should know how to configure DNS for Active Directory.
Click Next to continue when the New Zone wizard appears. Ensure that Standard Primary is selected and click Next. Ensure that Reverse Lookup Zone is selected and click Next. Ensure that Network ID is selected, type your network ID in the Network ID field, and click Next. Select Create a New File With This File Name and click Next. You should now configure the forward and reverse lookup zones for dynamic updating so that you do not get stuck creating all the records required for Active Directory yourself!
Sometimes this is required for diagnostic purposes, more frequently these days it is used for security purposes to trace a hacker or spammer.
Indeed, most modern mailing systems use reverse mapping to provide simple, first-cut, authentication using a dual look-up process - IP to name and name to IP.
Also keep in mind that the Active Directory Installation wizard does not install a reverse lookup zone. Right-click the Forward Lookup Zone folder and choose New Zone. Click Next to continue when the New Zone wizard appears. Typically, a Windows Server 2003 and later DNS namespace is deployed to mirror an Active Directory forest and domain infrastructure.In such a deployment, a partition of the DNS namespace is set aside for Active Directory, where a DNS domain name such as corp.is used support the Active Directory forest root domain, and then subdomains of this name are created to suit additional Active Directory domains as needed.When you install Active Directory Domain Services (AD DS) with the Active Directory Domain Services Installation Wizard, the wizard gives you the option to automatically install and configure a DNS server.The resulting DNS zone is integrated with the AD DS domain that is controlled by the AD DS server.
Historically IPv4 address were allcated in /8 blocks to RIRs but due to IPv4 address depletion this is no longer possible.