NV2 QOS. Mikrotik Please give us a bit more informations

According to the Wiki :

"Nv2-qos=default

In this mode outgoing frame at first is inspected by built-in QoS policy algorithm that selects queue based on packet type and size"


It is possible to have details about this magic matching :

What are packet types, what are size thresholds and how are selected queues ?


The Wiki says nothing about the internal of this.

Is there a way too check for each NV2 queue allocated packets ?

Thanks for helping.