lec-2 - Today's Agenda Network Structure Delays in packet...

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5 Aug 2008  BITS C481 (Computer Networks) 1 Today’s Agenda Network Structure Delays in packet switched networks
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5 Aug 2008  BITS C481 (Computer Networks) 2 Network Structure Network edge Applications and hosts Network core Routers Network of networks Access networks, physical media Communication links
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5 Aug 2008  BITS C481 (Computer Networks) 3 The network edge End systems (hosts): Run application programs e.g. Web, email at “edge of network” Client/server model Client host requests, receives service from always-on server e.g. Web browser/server; email client/server Peer-peer model: Minimal (or no) use of dedicated servers e.g. Skype, BitTorrent, KaZaA
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5 Aug 2008  BITS C481 (Computer Networks) 4 The Network Core Mesh of interconnected routers The fundamental question? How is data transferred through net or how to build the core? Circuit switching: Dedicated circuit per call ex: telephone net Packet-switching: Data Sent through net in discrete “chunks
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5 Aug 2008  BITS C481 (Computer Networks) 5 Network Core: Circuit Switching End to end resources reserved for “call” link bandwidth,
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lec-2 - Today's Agenda Network Structure Delays in packet...

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