lec-24 - What's Next. Network Layer Network layer service...

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4 Oct 2008  BITS C481 (Computer Networks) 1 What’s Next… Network Layer Network layer service models √ Forwarding versus routing √ How a router works √ IPv4 Datagram and Fragmentation IPv4 Addressing………Today !!! NAT Sub Netting IPv4 to IPv6 translation ICMP Routing (path selection) Multicast Routing Internet protocol
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4 Oct 2008  BITS C481 (Computer Networks) 2 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
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 BITS C481 (Computer Networks) 3 IP datagram format ver length 32 bits data  (variable length, typically a TCP  or UDP segment) 16-bit identifier header  checksum time to live 32 bit source IP address IP protocol version number header length  (bytes) max number remaining hops (decremented at  each router) for fragmentation/ reassembly total datagram length (bytes) upper layer protocol to deliver payload to head. len type of service “type” of data  flags fragment  offset upper  layer 32 bit destination IP address Options (if any) E.g. timestamp, record route taken, specify list of routers 
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lec-24 - What's Next. Network Layer Network layer service...

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