net_overview_ip - Network Layer Overview and IP Network...

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Network Layer 4-1 Network Layer Overview and IP
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Network Layer 4-2 Network layer transport segment from sending to receiving host on sending side encapsulates segments into datagrams on rcving side, delivers segments to transport layer network layer protocols in every host, router Router examines header fields in all IP datagrams passing through it network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical network data link physical applicatio n transport network data link physical applicatio n transport network data link physical
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Network Layer 4-3 Key Network-Layer Functions forwarding: move packets from router’s input to appropriate router output routing: determine route taken by packets from source to dest. Routing algorithms
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Network Layer 4-4 1 2 3 0111 value in arriving packet’s header routing algorithm local forwarding table header value output link 0100 0101 0111 1001 3 2 2 1 Interplay between routing and forwarding
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Network Layer 4-5 Network service model Example services for individual datagrams: guaranteed delivery Guaranteed delivery with less than 40 msec delay Example services for a flow of datagrams: In-order datagram delivery Guaranteed minimum bandwidth to flow Restrictions on changes in inter-packet spacing
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Network Layer 4-6 Virtual circuits call setup, teardown for each call before data can flow each packet carries VC identifier (not destination host address) every router on source-dest path maintains “state” for each passing connection link, router resources (bandwidth, buffers) may be allocated to VC “source-to-dest path behaves much like telephone circuit” performance-wise network actions along source-to-dest path
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Network Layer 4-7 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 Why is this OK for the Internet? applicatio n transport network data link physical applicatio n transport network data link physical 1. Send data 2. Receive data
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Network Layer 4-8 Forwarding table Destination Address Range                                            Link Interface          11001000 00010111 00010000 00000000                                        through                                                                  0            11001000 00010111 00010111 11111111          11001000 00010111 00011000 00000000                                       through                                                                   1
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