Difference between "RenewDHCPLease()" and "IPConfig /renew"?

Question

I am using RenewDHCPLease() to renew the IP address of the system.

1. What is the exact difference between RenewDHCPLease() and ipconfig /renew?
2. Which one is better to use in Powershell?
3. Is it necessary to use ReleaseDHCPLease() before RenewDHCPLease()? If so why?

Below is my code:

try {
    $ips = Get-WmiObject -Class Win32_NetworkAdapterConfiguration | Where { $_.IpEnabled -eq $true -and $_.DhcpEnabled -eq $true} -ErrorAction Stop
    if (!$ips) {
        Write-Output "`nDHCP is not Enabled on this system"
        Exit
    }
    foreach ($ip in $ips) { 
        Write-Output "`nRenewing IP Addresses" 
        $ip.RenewDHCPLease() | Out-Null  
        if ($?) {
            Write-Output "IP address has been renewed for this system"
        }
        else {
            Write-Error "IP Address Could not be renewed"
        }
    }
}
catch {
    $_.Exception.Message
}

Answer 1

ReleaseDHCPLease releases the IP address bound to a specific DHCP enabled network adapter RenewDHCPLease Renews the IP address on a specific DHCP enabled network adapter

There is no need to use ReleaseDHCPLease before RenewDHCPLease since the old address is released and a new one is automatically acquired when using RenewDHCPLease

Get-WmiObject Win32_NetworkAdapterConfiguration -Filter 'IpEnabled=True AND DhcpEnabled=True' | Foreach-Object{
    $_.RenewDHCPLease() 
}

You could also use the RenewDHCPLeaseAll method to renew them all at once. Hope this helps :)