9 - Extending LANs Fiber modems Repeaters Bridges Switches...

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Extending LANs Fiber modems Repeaters Bridges Switches
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Distance limitation in LANs MAC protocols such as CSMA/CD require time proportional to the length of the cable Electrical signal weakens with distance Network designers choose a combination of capacity, delay and distance that can be achieved within a given cost
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Fiber optic extensions Fiber modems extend connection between computer and transceiver
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Repeaters Join Ethernet cables (segments) together Amplified signal - no knowledge of frames Deals with signal strength, but not delay
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Multiple repeaters Ethernet standard says no more than four repeaters between two computers
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Fiber modems can be used between repeaters for long distance extensions Biggest problem with repeaters is that they transmit all signals including collisions and noise which limits scalability
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Bridges Connect two segments, but work at the frame level Use promiscuous mode and forward all frames Don’t forward erroneous frames (e.g., collisions and noise)
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9 - Extending LANs Fiber modems Repeaters Bridges Switches...

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