$DHCPServer = "DHCPSRV001"
$DNSServer = "192.168.1.1","192.168.1.2"
$LeaseDuration = "04:00:00"

Write-Host "Collecting DHCP Scope" -ForegroundColor Green
$scope = Get-DhcpServerv4Scope -ComputerName $DHCPServer
$scope.count

Write-Host "Collecting DHCP Scope with empty lease time" -ForegroundColor Green
$noleasetime = $scope.where{$_.LeaseDuration -like "00:00:00"}
$noleasetime.Count

Write-Host "Set DHCP lease time to 4 hour" -ForegroundColor Yellow
$noleasetime | Set-DhcpServerv4Scope -LeaseDuration $LeaseDuration -ComputerName $DHCPServer -WhatIf

Write-Host "Collecting DHCP Scope with empty DNS server option" -ForegroundColor Green
$scopeMissingDNS = foreach ($s in $scope){
    $sOption = $s | Get-DhcpServerv4OptionValue -ComputerName $DHCPServer
    if ($sOption.OptionId -notcontains "6"){
        [pscustomobject]@{
        ScopeID = $s.ScopeId
        }
    }
}
$scopeMissingDNS.Count

Write-Host "Set DHCP Scope with DNS server option $DNSServer" -ForegroundColor yellow
$scopeMissingDNS | Set-DhcpServerv4OptionValue -OptionId 6 -Value $DNSServer -ComputerName $DHCPServer -WhatIf

Write-Host "Collecting DHCP Scope with empty Route" -ForegroundColor Green
$scopeMissingRoute = foreach ($s in $scope){
    $sOption = $s | Get-DhcpServerv4OptionValue -ComputerName $DHCPServer
    if ($sOption.OptionId -notcontains "3"){
        [pscustomobject]@{
        ScopeID = $s.ScopeId
        }
    }
}
$scopeMissingRoute.Count