Chapter 4 Notes

Chapter 4 Notes - Network Layer t ransport segment from...

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Network Layer - transport segment from sending to receiving host - on sending side encapsulates segments into datagrams - on receiving side, delivers segments to transport layer - network layer protocols in every host, router - router examines header fields in all IP datagrams passing through it Two Network-Layer Functions - forwarding: move packets from router’s input to appropriate router output - routing: determine route taken by packets from source to destination. Network vs. transport layer connection service: - network: between two hosts (may also involve intervening routers in case of VCs) - transport: between two processes Network Service Models: o Individual datagram: - guaranteed delivery - guaranteed delivery with less than 40 msec delay o Flow of datagrams - in-order datagram delivery - guaranteed minimum bandwidth to flow - restrictions on changes in inter-packet spacing Connection and connection less service - datagram network provides network-layer connectionless service -
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