how persistent order of udp packets in lan? -

generally udp doesn't garantee packets arrive in same order sent. in 1 lan if sender , receiver connected via 1 switch , route never changes possible @ order of udp packets changed?

in particular can order of udp packets change somewhere between network card , application? in network card drivers example?

can if 2 computers connected via on switch in 100% of cases order of udp packets unchanged?

they arrive in order in test setup, relying on fact really bad idea. add sequence number packets or use tcp if appropiate.