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If you have multiple disjoint business units or have the need for separate security boundaries, you need multiple forests. In many small and medium organizations (and even some large ones), you will only find a single domain in a single forest.The forest root domain defines the default namespace for the forest.One of the great things I like about the (not so) new Windows 2008 R2 Powershell modules is that we can now more easily manage the core Microsoft Networking services (DNS, DHCP).
You can see that the child domain's name was prepended forest root domain's name. You can have disjoint namespaces in the same forest, but that's a whole separate can of worms for a different time.Lines 17-18: This is where we’re extracting the short DNS name from the FQDN and the DNS zone name.Also we are converting the IP address to the format required for entry into DNS: Lines 27-31: or To update an existing A record.In the past automating this kind of thing was possible using a combination of WMI and VBS/Powershell and or batch scripting and using the famous DNSCMD.My script script will not work on any DNS server, you need to run Windows 2008 or later DNS, running against Windows 2003 DNS servers will yield strange/wrong results. String]$Resource Record File = "C:\Temp\somefile.txt", [Parameter(Mandatory=$false)][System. String]$dnsserver = "DNS.constoso.com" ) import-module DNSServer Write-Warning "This script updates DNS resource records in DNS based on information in a CSV file.