Sanjeev ghai IRS

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1 8. Network Devices ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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2 Functions of network devices Separating (connecting) networks or expanding network e.g. repeaters, hubs, bridges, routers, brouters, switches, gateways Remote access e.g. 56K Modems and ADSL modems ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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3 A. Expanding Network Networks cannot be made larger by simply adding new computers and more cables Less efficient !! Can install components to segment (divide) large LAN to form smaller LANs connect LANs Required components Repeaters, bridges, routers, brouters, switches or gateways ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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4 Repeaters or hubs work at the OSI physical layer to regenerate the network’s signal and resend them to other segments Primitive hub can be viewed as a multiport repeater It regenerates data and broadcasts them to all ports a. Repeaters and Hubs Hub ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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5 Limitations and Features Cannot link unlike segments Cannot join segments with different access methods (e.g. CSMA/CD and token passing) Do not isolate and filter packets Can connect different types of media The most economic way of expanding networks ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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6 b. Bridges Has one input and one output Used to isolate network traffic and computers Has the intelligent to examine incoming packet source and destination addresses But cannot interpret higher-level information Hence cannot filter packet according to its protocol ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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7 How Bridges Work Bridges work at the Media Access Control Sub-layer of the OSI model Routing table is built to record the segment no. of address If destination address is in the same segment as the source address, stop transmit Otherwise, forward to the other segment ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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8 Creating a Switching Table Based on the addresses of the sending computers New addresses are added if they are not in the table Add01 Add03 Add02 S 01 D 02 Switching Table Seg 1 Seg 2 01 02 Stop S 02 D 01 ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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9 Remote Bridges Bridges are often used in large networks that have widely dispersed segments Remote bridges can be used to connect remote segments via data-grade telephone line ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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10 Differences Between Bridges and Repeaters ENG224 INFORMATION TECHNOLOGY – Part I 8. Network Devices

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