Datagram networks no call setup at network layer routers:no state about end-to-end connections o no network-level concept of "connection" packets forwarded using destination host address o packets between same source-dest pair may take different paths application fransport application network fransport data link 1.Send data network 2 Receive data data link physical physical Network Layer 4-16Network Layer 4-16 Datagram networks  no call setup at network layer  routers: no state about end-to-end connections  no network-level concept of “connection”  packets forwarded using destination host address  packets between same source-dest pair may take different paths application transport network data link physical application transport network data link physical 1. Send data 2. Receive data