Network Devices Interconnections

Network Devices Interconnections - Physical Layer Dijiang...

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Physical Layer Dijiang Huang
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2 Overview: What types of technologies or topologies are used in LANs?
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3 Why do we have LANs? People that work together, talk together. People who are close together talk more than people who are farther apart Locality of Reference
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4 Simple Topology Point to Point connectivity Doesn’t scale well!! (n 2 -n)/2
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5 Star Topology All inter-machine communications go through hub. Hub: Bottleneck? Data flow control? Maintenance tool? D C B A F E
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6 Star Topology To send data from host A to host C : Source host sends to hub D C B A F E
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7 Star Topology To send data from host A to host C : Hub: May forward packet to all other hosts D C B A F E
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8 Star Topology To send data from host A to host C : Hub: May forward to target destination only D C B A F E
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9 Ring Topology Closed Loop Connectivity Each node connected to 2 others. D C B A F E
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10 Ring Topology To send data from host A to host C : Host A forwards packet to host B. D C B A F E
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11 Ring Topology To send data from host A to host C : Host B tests data. It then forwards packet to host C . D C B A F E
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12 Bus Topology Shared Connectivity (Bus) All hosts contend for control of the bus Data propagates to all hosts. Only addressed host processes data A B C D E F
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13 Bus Topology To send data from host A to host C: Host A sends data over bus to all hosts A B C D E F
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14 Bus Topology To send data from host A to host C: Host C recognizes destination address in data and processes data A B C D E F
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15 CSMA-CD Early Ethernet used bus topology
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Network Devices Interconnections - Physical Layer Dijiang...

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