Transcription of Chapter 7 Packet-Switching Networks - UCCS
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Chapter 7 Packet-Switching Networks - UCCS
1 Chapter 7 Packet-Switching NetworksNetworksNetwork Services and Internal network OperationPacket network TopologyDatagrams and Virtual CircuitsRouting in packet NetworksgShortest Path RoutingATM NetworksTraffic ManagementNetwork Layer network Layer: the most complex layer Requires the coordinated actions of multiple Requires the coordinated actions of multiple, geographically distributed network elements (switches & routers) Must be able to deal with very large scales Billions of users (people & communicating devices) Biggest Challengesggg Addressing: where should information be directed to? routing : what path should be used to get information there?2t0t1 packet SwitchingNetworkTransfer of information as payload in data packets Transfer of information as payload in data packets Packets undergo random delays & possible loss Different applications impose differing requirements on the transfer of informationTransportTransportMessagesMes sagesSegmentsNetwork ServiceEnd system PhysicalData linklayerPhysicalData linklayerEnd systemNetworklayerNetworklayerPhysicalDa ta linklayerNetworklayerPhysicalData linklayerNetworklayerplayerTransportlaye rNetworkserviceNetworkservice PhysicallayerPhysicallayer PhysicallayerPhysicallayer network layer can offer a variety of services to transport layer Connection-oriented service or connectionless service Best-effort or delay/loss guarantees3 network Service vs.
Comparison of VC and Datagram Subnets 5-4 Chapter 7 Packet-Switching Networks Routing in Packet Networks. 17 1 3 6 Routing in Packet Networks 2 4 …
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