On which principles FreeBSD giving the NICs ports identity?

Hi, all FreeBSD Gurus!

Could You be so please to explain:
On which principles FreeBSD giving the NICs ports identity?

From my knowledge, there are involved (from HIGHT IMPACT to LOW):
motherboard schematics,
BIOS subsystem,
NICs mechanical interface (PCI, PCI-e, etc...),
NICs order in motherboard slots,
FreeBSD drivers,
...
?

Thank You for help and opinions!
 
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