Monitor has (DisplayPort, DVI-D, VGA and USB 2.0) connections. Can I also only connect it to the notebook with USB 2.0?
You mean, operate with USB 2.0? No, that is not possible, the transfer rate is not sufficient.
Then why does the monitor have a USB 2.0 port?
… And a USB 2.0 cable is included?
Probably to control it somehow in terms of software.
What kind of monitor is it, do you have the exact name, then I'll find out?