Restrict getting ip address in mikrotik

Dear all,
Is there any way to restrict a new computer connect to my network to get ip address???

You could set your IP Pool to just the same number of devices as you want to have
And set them all for static reservation
Then any new device will not be able to get IP Address from DHCP Server as there are no more IP Address left in the pool.

Of course user could still set a static IP and get access to the network, so this is not a method of creating security. But it will do what you asked which is to stop a new computer from getting an IP Address.

thanks for your replay, i want yo secure my network by restricting any new device to get ip without my permission . After a permission the the device can get ip. if i make a dhcp for number of my client a new device can not get ip even after my permission.
thanks