Powershell - Netzwerk der Domain oder nicht? Wie herausfinden

Function GetOnlineStatus{

    Logging -Message "Prüfe Online-Status..." -LogType Info  

    $adapters = (Get-NetAdapter | where {$_.Status -eq 'up'})  
    $isUp = @()

    foreach ($ad in $adapters)
    {
        $isUp += $ad | Select-Object InterfaceType, MediaType, [a-z]*MediaType, InterfaceDescription
    }


    $VPN = $isUp | Where-Object {$_.InterfaceType -eq '6' -and $_.InterfaceType -ne '71' -and `  
        ([regex]::Match($_.InterfaceDescription, 'cisco', [System.Text.RegularExpressions.RegexOptions]::IgnoreCase).success) -and `  
        ([regex]::Match($_.MediaType, '802.3', [System.Text.RegularExpressions.RegexOptions]::IgnoreCase).success)}  

    $LAN = $isUp | Where-Object {$_.InterfaceType -eq '6' -and $_.InterfaceType -ne '71' -and `  
        (![regex]::Match($_.InterfaceDescription, 'cisco', [System.Text.RegularExpressions.RegexOptions]::IgnoreCase).success) -and `  
        ([regex]::Match($_.MediaType, '802.3', [System.Text.RegularExpressions.RegexOptions]::IgnoreCase).success)}  


    $WLAN = $isUp | Where-Object {$_.InterfaceType -ne '6' -and $_.InterfaceType -eq '71' -and `  
        (![regex]::Match($_.InterfaceDescription, 'cisco', [System.Text.RegularExpressions.RegexOptions]::IgnoreCase).success) -and `  
        ([regex]::Match($_.MediaType, '802.11', [System.Text.RegularExpressions.RegexOptions]::IgnoreCase).success)}  


    $toReturn = 'OFFLINE'  
    if($LAN -ne $null )
    {
        Logging -Message "Online-Status: Online via LAN `n`n Adapterdertails:`n $LAN" -LogType Info  
        $toReturn = 'ONLINE'  
    }
    elseif($WLAN -ne $null -and $VPN -ne $null)
    {
        Logging -Message "Online-Status: Online via WLAN `n`n Adapterdertails:`n $WLAN" -LogType Info  
        $toReturn = 'ONLINE'  
    }
    elseif($WLAN -ne $null)
    {
        Logging -Message "Online-Status: Online via WLAN `n`n Adapterdertails:`n $WLAN" -LogType Info  
        $toReturn = 'ONLINE'  
    }
    
    if($toReturn = 'ONLINE')  
    {
        Logging -Message "Prüfe Verfügbarkeit des Servers..." -LogType Info  

        if( (Test-Connection -ComputerName $targetServer -Quiet) -eq $false )
        {
            Logging -Message "Server konnte nicht erreicht werden!!" -LogType Info  
            Logging -Message "OFFLINE- Einrichtung wird begonnen!!" -LogType Info  
            $toReturn = 'OFFLINE'  
        }
    }
    return $toReturn
}