PoE help

Hey everybody,

Been lurking for a while now. Finally making my first post. Anyway, I need some clarification on how exactly I'd use PoE on a device that supports it. For reference, this is the device I'm considering. It has a dc power input and PoE-in on the internet port.

What I'm wondering is will it provide PoE out ports 2-5 regardless of how I power it? (eg. dc input vs PoE-in port)

And just to be clear, I'm more asking this in general, not just in the context of the mikrotik device. That just happens to be the device that sparked this question.

Thanks in advance for your help everybody.