Router work in which layer of osi model?

Routers work in layers two, three, and four

layer 1 Physical (copper, fiber,...)

layer 2 Datalink (ethernet, token ring, ...)

2->3 providing address resolution (ARP) ie. media access control (MAC) to IP translation

layer 3 Network (IP,IPX,RIP,...)

3->4 providing routing

layer 4 Transport provides error handling in connectin oriented delivery and handles connectionless delivery Conneciton Oriented(TCP,SPX) Connectionless (UDP)