There can be more than a few connectivity ports in a laptop or desktop computer but due to space and power constraints that's not the case for these devices. Therefore, when buying one should keep in mind what all ports the device has. A netbook should be equipped with at least 3 USB 2.0 ports, a VGA out, Ethernet, microphone in and headphone out ports.

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On the other hand, a nettop if not equipped with PS/2, should atleast have 4-5 USB 2.0 ports as a key¬board and a mouse might also be required to be con¬nected at the same time.