To Get all Scopes – Open PowerShell – Run as Administrator
Get-DhcpServerv4Scope
To Check DNS Servers Option 006
Get-DhcpServerv4Scope | Get-DhcpServerv4OptionValue | Where-Object {$_.OptionID -like 6} | FT Value
To Check – Whatif
Get-DhcpServerv4Scope | Set-DhcpServerv4OptionValue -DnsServer 172.21.10.20,172.21.10.21,10.10.11.10,10.10.11.11 –Whatif
To Apply
Get-DhcpServerv4Scope | Set-DhcpServerv4OptionValue -DnsServer 172.21.10.20,172.21.10.21,10.10.11.10,10.10.11.11
To Check if its Applied or Not
Get-DhcpServerv4Scope | Get-DhcpServerv4OptionValue | Where-Object {$_.OptionID -like 6} | FT Value
You can see 006 DNS Servers Updated for all scopes
 to your administration terminal and then you can use the Set-DhcpServerv4OptionValue CmdLet to update your scope.){kind=link}
Great article. Just what I needed. Thanks for taking the time to create it.