function Ping-Host([string]$hostName) {
     $pinger = new-object system.Net.NetworkInformation.Ping;
     return $pinger.Send($hostName);
}

function Resolve-HostByAddress([string]$ipAddress) {
     return [System.Net.Dns]::GetHostByAddress($ipAddress);
}

function Resolve-HostByName([string]$hostName) {
     return [System.Net.Dns]::GetHostByName($hostName);
}

function New-MachineObject($hostName = "", $ipAddress = "", $macAddress = "", $alive = "") {
	$machine = New-Object System.Object;
	Add-Member -InputObject $machine -MemberType NoteProperty -name "HostName" -Value $hostName;
	Add-Member -InputObject $machine -MemberType NoteProperty -name "IpAddress" -Value $ipAddress;
	Add-Member -InputObject $machine -MemberType NoteProperty -name "MacAddress" -Value $macAddress;
	Add-Member -InputObject $machine -MemberType NoteProperty -name "Alive" -Value $alive;
	return $machine;
}

function Get-MacAddressForHost($hostName, $ipAddress) {
	$networkAdapters = get-wmiobject Win32_NetworkAdapterConfiguration -computername $hostName -Filter "IPenabled = 'True'";

        foreach ($adapter in $networkAdapters) {
		if ($adapter.IPAddress -eq $ipAddress) {
                	return $adapter.MACAddress; 
		}
        } 
}

function Get-AliveStatus($hostName) {
	$response = Ping-Host $hostName;
	if ($response.Status -eq [System.Net.NetworkInformation.IPStatus]::Success) {
		return $true;
	}
	else {
		return $false;
	}
}