LGW2EChapter7figures

LGW2EChapter7figures - Chapter 7 Packet-Switching Networks...

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Chapter 7 Packet-Switching Networks Chapter Figures
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Leon-Garcia/Widjaja Communication Networks t 0 t 1 Network Figure 7.1
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Leon-Garcia/Widjaja Communication Networks End system β Physical layer Data link layer Physical layer Data link layer End system α Network layer Network layer Physical layer Data link layer Network layer Physical layer Data link layer Network layer Transport layer Transport layer Messages Messages Segments Network service Network service Figure 7.2
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Leon-Garcia/Widjaja Communication Networks 1 1 3 3 2 1 2 2 3 2 1 1 2 2 1 2 1 Medium A B 3 2 1 1 2 2 1 C 2 1 2 1 2 1 4 1 2 3 4 End system α End system β Network 1 2 Physical layer entity Data link layer entity 3 Network layer entity 3 Network layer entity Transport layer entity 4 Figure 7.3
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Leon-Garcia/Widjaja Communication Networks Access MUX To packet network Figure 7.4
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Leon-Garcia/Widjaja Communication Networks R R R R S S S s s s s s s s s s s R s R Backbone To Internet or wide area network Organization Servers Gateway Depart- mental Server Figure 7.5
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Leon-Garcia/Widjaja Communication Networks Interdomain level Intradomain level LAN level Autonomous system or domain Border routers Border routers Internet service provider Figure 7.6
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Leon-Garcia/Widjaja Communication Networks National Service Provider A National Service Provider B National Service Provider C NAP NAP Private peering Figure 7.7
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Leon-Garcia/Widjaja Communication Networks Packet switch Network Transmission line User Figure 7.8
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Leon-Garcia/Widjaja Communication Networks Switches Message Destination Source Message Message Message Figure 7.9
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Leon-Garcia/Widjaja Communication Networks t t t t Delay Source Destination T τ Minimum delay = 3 τ + 3 T Switch 1 Switch 2 Figure 7.10
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Leon-Garcia/Widjaja Communication Networks Packet 2 Packet 1 Packet 1 Packet 2 Packet 2 Figure 7.11
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Leon-Garcia/Widjaja Communication Networks t t t t 3 1 2 3 1 2 3 2 1 3 τ + 2( T /3) first bit received 3 τ + 3( T /3) first bit released 3 τ + 5 ( T /3) last bit released L τ + (L- 1 )P first bit received L τ + LP first bit released L τ + LP + (k- 1 )P last bit released where T = k P 3 hops L hops Source Destination Switch 1 Switch 2 τ Figure 7.12
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Leon-Garcia/Widjaja Communication Networks Destination address Output port 1345 12 2458 7 0785 6 12 1566 Figure 7.13
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Leon-Garcia/Widjaja Communication Networks Virtual circuit Packet Packet Packet Packet Figure 7.14
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Leon-Garcia/Widjaja Communication Networks t t t t 3 1 2 3 1 2 3 2 1 Release Connect request CR CR Connect confirm CC CC Figure 7.15
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Leon-Garcia/Widjaja Communication Networks SW 1 SW 2 SW n Connect request Connect request Connect request Connect confirm Connect confirm Connect confirm Figure 7.16
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Leon-Garcia/Widjaja Communication Networks Input VCI Output port Output VCI Entry for packets with VCI 15 15 15 58 13 13 7 27 12 44 23 16 34 Figure 7.17
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