Monitor ports are connection points that allow various data and information flow. Over time, the evolution of monitor ports has resulted in ports that can also power and charge the devices they connect.
There is no comparison between a hdd enclosure and a mobile hard drive, because the hdd enclosure is just a box and does not have storage capabilities by itself.
The protocol of the hard disk box actually refers to what protocol the hard disk box supports. Generally, the protocol of the hard disk box is the same as the hard disk protocol.