The Internet Network layer Host,router network layer functions: Transport layer:TCP,UDP Routing protocols IP protocol path selection .addressing conventions .datagram format Network ·RIP,OSPF,BGP -packet handling conventions layer forwarding table ICMP protocol .error reporting router "signaling" Link layer physical layer Network Layer 4-31 Network Layer 4-31 The Internet Network layer forwarding table Host, router network layer functions: Routing protocols •path selection •RIP, OSPF, BGP IP protocol •addressing conventions •datagram format •packet handling conventions ICMP protocol •error reporting •router “signaling” Transport layer: TCP, UDP Link layer physical layer Network layer