Data-Link Layer

is it possible that two different technologies (adhoc and ethernet ) work at same time on Data Link Layer

supose we hv 3 systems. centerlised system hv 2 lancards. one PCI card of realtek and second wireless of linksys. PCI card ip address is 192.168.1.1 and its connected system ip address is 192.168.1.2. wireless lancard address is 172.168.15.1 and it connected wd other wireless system address...

OSI Layer

What is the difference between layer 2 and layer 3 in the OSI model?